# Product Requirements Document: Warehouse Management System

## 1. Overview

The Warehouse Management System (WMS) is a comprehensive application designed to manage and optimize warehouse operations including inventory tracking, receiving, storage, picking, packing, and shipping of goods. The system enables warehouse staff to efficiently process orders, maintain accurate inventory levels, and track product movement throughout the facility. This application provides real-time visibility into warehouse operations, reduces errors, and improves overall operational efficiency.

## 2. User Roles

### 2.1 System Administrator
- Manage user accounts and permissions
- Configure warehouse settings and locations
- Manage suppliers and customers
- View system-wide reports and analytics
- Configure product categories and units of measure
- Manage system integrations and settings

### 2.2 Warehouse Manager
- Oversee all warehouse operations
- Approve/reject purchase orders and transfer requests
- Assign tasks to warehouse staff
- View and generate operational reports
- Manage warehouse zones and storage locations
- Set reorder points and inventory thresholds
- Review and resolve inventory discrepancies

### 2.3 Inventory Manager
- Manage product catalog and SKUs
- Conduct cycle counts and physical inventories
- Adjust inventory levels with proper authorization
- Monitor stock levels and generate reorder alerts
- Manage product attributes and specifications
- Track inventory aging and expiration dates

### 2.4 Receiving Clerk
- Process incoming shipments and deliveries
- Verify received quantities against purchase orders
- Inspect goods for quality and damage
- Generate receiving reports
- Update inventory upon receipt
- Print and apply labels to received items

### 2.5 Picker
- View and accept assigned pick tasks
- Navigate to storage locations using the system
- Pick items according to pick lists
- Confirm picked quantities
- Report discrepancies or issues
- Stage picked items for packing

### 2.6 Packer
- View items staged for packing
- Pack orders according to packing instructions
- Generate packing slips and shipping labels
- Record package dimensions and weights
- Mark orders as packed and ready to ship
- Handle special packaging requirements

### 2.7 Shipping Clerk
- Process outbound shipments
- Verify packed orders against shipping documents
- Arrange carrier pickups
- Generate bills of lading and shipping manifests
- Update order status to shipped
- Track shipment status

### 2.8 Auditor (Read-Only)
- View all warehouse transactions
- Access reports and analytics
- Review inventory accuracy metrics
- Monitor compliance with procedures
- Export data for external analysis

## 3. Core Entities

### 3.1 User
A system user with specific role(s) and permissions who performs warehouse operations.

### 3.2 Warehouse
A physical facility where inventory is stored, with multiple zones and storage locations.

### 3.3 Zone
A designated area within a warehouse (e.g., receiving, storage, picking, packing, shipping, quarantine).

### 3.4 Location
A specific storage position within a zone identified by aisle, rack, shelf, and bin coordinates.

### 3.5 Product
An item or SKU managed in the warehouse with attributes like name, description, barcode, dimensions, and weight.

### 3.6 Product Category
A hierarchical classification system for organizing products.

### 3.7 Unit of Measure (UOM)
Measurement units for products (e.g., each, case, pallet) with conversion factors.

### 3.8 Supplier
A vendor or manufacturer from whom products are purchased.

### 3.9 Customer
An entity to whom products are sold and shipped.

### 3.10 Purchase Order (PO)
A document authorizing the purchase of products from a supplier.

### 3.11 Purchase Order Line Item
Individual product entries within a purchase order specifying quantity and price.

### 3.12 Receipt
A record of goods received into the warehouse, linked to a purchase order or standalone.

### 3.13 Receipt Line Item
Individual product entries within a receipt documenting received quantities.

### 3.14 Inventory
Current stock levels of products at specific locations within the warehouse.

### 3.15 Inventory Transaction
A historical record of all inventory movements (receipts, picks, adjustments, transfers).

### 3.16 Sales Order
A customer order requesting products to be fulfilled and shipped from the warehouse.

### 3.17 Sales Order Line Item
Individual product entries within a sales order specifying quantity and price.

### 3.18 Pick Task
A work assignment for a picker to retrieve specific products from storage locations.

### 3.19 Pick List
A grouped collection of pick tasks, often optimized by location or order priority.

### 3.20 Shipment
A collection of packed orders ready for or already dispatched to customers.

### 3.21 Package
A physical container holding products for a shipment with dimensions and weight.

### 3.22 Carrier
A shipping company or service used to transport goods to customers.

### 3.23 Inventory Adjustment
A record of manual inventory corrections due to damage, loss, or count discrepancies.

### 3.24 Cycle Count
A scheduled or ad-hoc physical count of inventory at specific locations.

### 3.25 Transfer Order
A request to move inventory between locations, zones, or warehouses.

### 3.26 Lot/Batch
A group of products manufactured or received together, tracked for traceability.

### 3.27 Serial Number
A unique identifier for individual product units requiring item-level tracking.

### 3.28 Alert/Notification
System-generated messages for low stock, expiring products, or operational issues.

### 3.29 Report
Predefined or custom analytical views of warehouse data and metrics.

## 4. Entity Relationships

### 4.1 User Relationships
- User → Warehouse: Many-to-Many (users can work in multiple warehouses)
- User → Pick Task: One-to-Many (one user assigned to many pick tasks)
- User → Inventory Transaction: One-to-Many (one user creates many transactions)

### 4.2 Warehouse Structure
- Warehouse → Zone: One-to-Many (one warehouse has many zones)
- Zone → Location: One-to-Many (one zone contains many locations)
- Location → Inventory: One-to-Many (one location holds many product inventories)

### 4.3 Product Relationships
- Product Category → Product: One-to-Many (one category contains many products)
- Product → Unit of Measure: Many-to-Many (products can have multiple UOMs)
- Product → Inventory: One-to-Many (one product exists in many locations)
- Product → Lot/Batch: One-to-Many (one product can have many lots)
- Product → Serial Number: One-to-Many (one product can have many serial numbers)

### 4.4 Purchase Order Relationships
- Supplier → Purchase Order: One-to-Many (one supplier has many POs)
- Purchase Order → Purchase Order Line Item: One-to-Many
- Purchase Order Line Item → Product: Many-to-One
- Purchase Order → Receipt: One-to-Many (one PO can have multiple receipts)
- Receipt → Receipt Line Item: One-to-Many
- Receipt Line Item → Inventory Transaction: One-to-Many

### 4.5 Sales Order Relationships
- Customer → Sales Order: One-to-Many (one customer has many orders)
- Sales Order → Sales Order Line Item: One-to-Many
- Sales Order Line Item → Product: Many-to-One
- Sales Order → Pick Task: One-to-Many (one order generates many pick tasks)
- Sales Order → Shipment: Many-to-One (multiple orders can be in one shipment)

### 4.6 Fulfillment Relationships
- Pick List → Pick Task: One-to-Many (one pick list contains many tasks)
- Pick Task → Location: Many-to-One (many tasks from one location)
- Pick Task → Product: Many-to-One
- Shipment → Package: One-to-Many (one shipment has many packages)
- Package → Sales Order: Many-to-Many (packages can contain items from multiple orders)
- Carrier → Shipment: One-to-Many (one carrier handles many shipments)

### 4.7 Inventory Management
- Inventory → Location: Many-to-One
- Inventory → Product: Many-to-One
- Inventory → Lot/Batch: Many-to-One (optional)
- Inventory Transaction → Inventory: Many-to-One
- Inventory Transaction → User: Many-to-One
- Cycle Count → Location: Many-to-Many
- Inventory Adjustment → Inventory: Many-to-One

### 4.8 Transfer Relationships
- Transfer Order → Warehouse: Many-to-One (source and destination)
- Transfer Order → Location: Many-to-One (source and destination)
- Transfer Order → Product: Many-to-Many (through line items)

## 5. Key Workflows

### 5.1 Receiving Workflow

**Step 1: Purchase Order Creation**
- Warehouse Manager or Inventory Manager creates a purchase order
- Add products, quantities, and expected delivery date
- Submit PO for approval (if required)
- System sends PO to supplier (optional integration)

**Step 2: Shipment Arrival**
- Receiving Clerk notified of incoming shipment
- Clerk creates a new receipt and links to PO (or creates standalone receipt)
- System displays expected items and quantities

**Step 3: Physical Inspection**
- Receiving Clerk verifies items against packing slip
- Scans barcodes or manually enters received quantities
- Notes any discrepancies (overages, shortages, damage)
- Takes photos of damaged items if necessary

**Step 4: Quality Check**
- Inspect products for quality issues
- Mark items as accepted, rejected, or quarantined
- Rejected items are documented with reason codes

**Step 5: Put-Away**
- System suggests optimal storage locations based on product type and availability
- Clerk confirms or selects alternative location
- Scans location barcode and product barcode to confirm placement
- System updates inventory levels in real-time

**Step 6: Receipt Completion**
- Generate and print receiving report
- Close receipt document
- System triggers notifications for discrepancies
- Update PO status (partially received or fully received)

### 5.2 Order Fulfillment Workflow

**Step 1: Order Entry**
- Sales order is created (manually or via integration)
- System validates product availability
- Order status set to "Pending"

**Step 2: Order Allocation**
- System reserves inventory for the order
- Checks for sufficient stock across all line items
- If stock insufficient, order marked as "Backordered"
- Allocates inventory from optimal locations (FIFO, FEFO, or zone-based)

**Step 3: Pick List Generation**
- Warehouse Manager or system automatically generates pick lists
- Orders are batched or wave-picked based on priority, zone, or carrier
- Pick tasks are created and optimized by location sequence

**Step 4: Picking**
- Picker receives assigned pick list on mobile device or printed document
- Navigates to each location in sequence
- Scans location and product barcodes to confirm correct item
- Enters or confirms picked quantity
- Reports short picks or discrepancies
- Stages picked items in designated packing area

**Step 5: Packing**
- Packer retrieves staged items for specific order
- Verifies items against packing list
- Selects appropriate packaging materials
- Packs items and enters package dimensions/weight
- Prints packing slip and shipping label
- Scans package barcode to confirm completion
- Moves package to shipping area

**Step 6: Shipping**
- Shipping Clerk verifies packages against shipping manifest
- Scans packages to load onto shipment
- Generates bill of lading
- Confirms carrier pickup or drop-off
- Updates order status to "Shipped"
- System sends tracking information to customer (if integrated)

### 5.3 Inventory Adjustment Workflow

**Step 1: Discrepancy Identification**
- User identifies inventory discrepancy during operations
- Or system flags discrepancy during cycle count

**Step 2: Adjustment Request**
- User creates inventory adjustment request
- Specifies product, location, current quantity, and new quantity
- Provides reason code and detailed notes
- Attaches supporting documentation if available

**Step 3: Approval Process**
- Adjustment request routed to Warehouse Manager or Inventory Manager
- Manager reviews request and supporting information
- Approves or rejects with comments

**Step 4: Adjustment Execution**
- Upon approval, system updates inventory levels
- Creates inventory transaction record
- Adjusts financial values if integrated with accounting
- Generates adjustment report

**Step 5: Audit Trail**
- All adjustments logged with user, timestamp, and reason
- Available for auditor review
- Included in inventory accuracy metrics

### 5.4 Cycle Count Workflow

**Step 1: Cycle Count Planning**
- Inventory Manager creates cycle count schedule
- Selects locations or products to count (ABC analysis, random, or full count)
- Assigns count to specific user(s)
- Sets count date and priority

**Step 2: Count Execution**
- Assigned user receives cycle count task
- Navigates to specified locations
- Physically counts inventory
- Enters counted quantities into system
- Flags items not found or unexpected items discovered

**Step 3: Variance Analysis**
- System compares counted quantities to system quantities
- Calculates variances and accuracy percentages
- Flags significant discrepancies for review

**Step 4: Recount (if needed)**
- If variance exceeds threshold, recount is triggered
- Different user performs blind recount
- Results compared again

**Step 5: Reconciliation**
- Inventory Manager reviews all variances
- Approves inventory adjustments for confirmed discrepancies
- Investigates root causes of significant variances
- Updates inventory records
- Generates cycle count report

### 5.5 Transfer Order Workflow

**Step 1: Transfer Request**
- User creates transfer order
- Specifies source and destination (location, zone, or warehouse)
- Adds products and quantities to transfer
- Provides reason for transfer

**Step 2: Approval**
- Warehouse Manager reviews and approves transfer request
- Or system auto-approves based on business rules

**Step 3: Pick from Source**
- Pick task generated for source location
- Picker retrieves items
- System decrements inventory at source

**Step 4: Transit**
- Items marked as "in transit"
- If inter-warehouse, shipment tracking may be used

**Step 5: Receive at Destination**
- Receiving process at destination location
- Verify quantities received
- Put away to destination location
- System increments inventory at destination

**Step 6: Transfer Completion**
- Transfer order marked as complete
- Inventory transaction records created
- Transfer report generated

### 5.6 Returns Processing Workflow

**Step 1: Return Authorization**
- Customer initiates return request
- Customer service creates Return Merchandise Authorization (RMA)
- RMA includes original order reference, items, quantities, and reason

**Step 2: Return Receipt**
- Receiving Clerk notified of incoming return
- Receives returned items and links to RMA
- Inspects items for condition

**Step 3: Disposition Decision**
- Based on condition and reason, items are:
  - Returned to stock (if resalable)
  - Sent to quarantine for inspection
  - Marked as damaged/defective
  - Scheduled for return to supplier

**Step 4: Inventory Update**
- If returned to stock, inventory incremented
- If scrapped, inventory adjustment created
- Inventory transaction recorded with return reason

**Step 5: Financial Processing**
- System triggers refund or credit process (if integrated)
- Updates order and customer records

## 6. Features & Requirements

### 6.1 User Management Module

**F-UM-001: User Authentication**
- Secure login with username and password
- Password complexity requirements
- Password reset functionality
- Session timeout after inactivity
- Multi-factor authentication support (optional)

**F-UM-002: User Profile Management**
- Create, read, update, delete user accounts
- Assign one or multiple roles to users
- Associate users with specific warehouses
- Set user status (active, inactive, suspended)
- Track user login history

**F-UM-003: Role-Based Access Control**
- Define granular permissions for each role
- Restrict access to features based on role
- Support custom role creation
- Audit trail of permission changes

**F-UM-004: User Activity Logging**
- Log all user actions with timestamp
- Track inventory transactions by user
- Generate user activity reports
- Support compliance and audit requirements

### 6.2 Warehouse Configuration Module

**F-WC-001: Warehouse Management**
- Create and manage multiple warehouses
- Define warehouse details (name, address, contact, timezone)
- Set warehouse-specific configurations
- Enable/disable warehouses

**F-WC-002: Zone Management**
- Create zones within warehouses
- Define zone types (receiving, storage, picking, packing, shipping, quarantine, returns)
- Set zone-specific rules and constraints
- Assign temperature or environmental controls to zones

**F-WC-003: Location Management**
- Create hierarchical location structure (aisle-rack-shelf-bin)
- Generate location barcodes
- Define location capacity and dimensions
- Set location types (pallet, shelf, floor, bulk)
- Mark locations as available, occupied, or blocked
- Support location aliases and alternate identifiers

**F-WC-004: Location Optimization**
- Suggest optimal put-away locations based on product velocity
- Support ABC classification for location assignment
- Enable location slotting strategies
- Track location utilization metrics

### 6.3 Product Management Module

**F-PM-001: Product Catalog**
- Create and manage product master data
- Define product attributes (SKU, name, description, barcode, UPC, EAN)
- Store product dimensions (length, width, height) and weight
- Upload product images
- Set product status (active, inactive, discontinued)

**F-PM-002: Product Categories**
- Create hierarchical category structure
- Assign products to categories
- Support multiple category assignments
- Filter and search products by category

**F-PM-003: Units of Measure**
- Define multiple UOMs per product (each, case, pallet)
- Set conversion factors between UOMs
- Specify base UOM for inventory tracking
- Support fractional quantities where applicable

**F-PM-004: Product Variants**
- Manage product variations (size, color, style)
- Link variants to parent product
- Track inventory separately for each variant

**F-PM-005: Product Attributes**
- Define custom product attributes
- Set product handling requirements (fragile, hazardous, temperature-controlled)
- Specify storage requirements
- Set shelf life and expiration tracking requirements

**F-PM-006: Barcode Management**
- Support multiple barcode formats (UPC, EAN, Code 128, QR)
- Generate internal barcodes for products without manufacturer codes
- Print product labels
- Support barcode scanning throughout system

### 6.4 Supplier & Customer Management Module

**F-SC-001: Supplier Management**
- Create and manage supplier records
- Store supplier contact information
- Track supplier performance metrics
- Set preferred suppliers for products
- Manage supplier payment terms

**F-SC-002: Customer Management**
- Create and manage customer records
- Store shipping and billing addresses
- Track customer order history
- Set customer-specific pricing or discounts (optional)
- Manage customer shipping preferences

**F-SC-003: Contact Management**
- Manage multiple contacts per supplier/customer
- Store contact roles and communication preferences
- Track communication history

### 6.5 Purchase Order Module

**F-PO-001: Purchase Order Creation**
- Create purchase orders manually
- Add multiple line items with products and quantities
- Set expected delivery date
- Specify delivery location (warehouse/zone)
- Add notes and special instructions
- Save as draft or submit for approval

**F-PO-002: Purchase Order Approval**
- Route PO for approval based on value thresholds
- Support multi-level approval workflows
- Approve or reject with comments
- Track approval history

**F-PO-003: Purchase Order Management**
- View list of all purchase orders with filters
- Search POs by number, supplier, date, status
- Edit draft or approved POs (with proper permissions)
- Cancel or close POs
- Track PO status (draft, pending approval, approved, partially received, received, closed, cancelled)

**F-PO-004: Purchase Order Tracking**
- View expected vs. received quantities
- Track outstanding POs
- Generate PO reports
- Set alerts for overdue deliveries

### 6.6 Receiving Module

**F-RC-001: Receipt Creation**
- Create receipt from purchase order
- Create standalone receipt (without PO)
- Support partial receipts against PO
- Add multiple line items

**F-RC-002: Receipt Processing**
- Scan or manually enter received quantities
- Compare received vs. expected quantities
- Flag discrepancies (overages, shortages)
- Record damaged or rejected items with reason codes
- Capture lot/batch numbers
- Capture serial numbers for serialized items
- Add photos of damaged goods

**F-RC-003: Quality Inspection**
- Mark items for quality inspection
- Record inspection results (pass, fail, quarantine)
- Route failed items to quarantine zone
- Generate inspection reports

**F-RC-004: Put-Away**
- System suggests optimal storage locations
- Scan location and product to confirm put-away
- Support directed put-away
- Allow manual location selection with override permission
- Update inventory in real-time upon put-away

**F-RC-005: Receipt Documentation**
- Generate receiving reports
- Print labels for received items
- Close and finalize receipts
- Email receipt confirmation to supplier (optional)

**F-RC-006: Receipt History**
- View all receipts with filters and search
- Track receipt status
- Audit trail of all receipt activities

### 6.7 Inventory Management Module

**F-IM-001: Inventory Tracking**
- Real-time inventory levels by product and location
- Track inventory by lot/batch
- Track inventory by serial number
- Support multi-location inventory for same product
- Display available, allocated, and on-hand quantities

**F-IM-002: Inventory Visibility**
- View inventory by product, location, zone, or warehouse
- Search and filter inventory
- Display inventory aging
- Show expiration dates for perishable items
- Highlight low stock and out-of-stock items

**F-IM-003: Inventory Allocation**
- Reserve inventory for sales orders
- Support allocation rules (FIFO, FEFO, LIFO)
- Prevent overselling
- Release allocations for cancelled orders

**F-IM-004: Inventory Adjustments**
- Create adjustment requests with reason codes
- Support adjustment types (damage, loss, found, correction)
- Require approval for adjustments above threshold
- Update inventory upon approval
- Generate adjustment reports

**F-IM-005: Lot/Batch Tracking**
- Assign lot/batch numbers at receipt
- Track lot/batch through all transactions
- Support lot/batch expiration dates
- Enable lot/batch traceability for recalls
- Generate lot/batch reports

**F-IM-006: Serial Number Tracking**
- Capture serial numbers at receipt
- Track serial numbers through picking and shipping
- Prevent duplicate serial numbers
- Support serial number lookup and history
- Enable warranty and service tracking

**F-IM-007: Inventory Transactions**
- Log all inventory movements
- Transaction types: receipt, pick, adjustment, transfer, cycle count
- Store transaction details (user, timestamp, quantity, location, reason)
- Support transaction reversal (with proper authorization)
- Generate transaction history reports

**F-IM-008: Reorder Management**
- Set reorder points and reorder quantities per product
- Generate low stock alerts
- Suggest purchase orders based on reorder points
- Support min/max inventory levels
- Track lead times for reordering

### 6.8 Sales Order Module

**F-SO-001: Sales Order Creation**
- Create sales orders manually
- Add multiple line items with products and quantities
- Set requested ship date
- Specify shipping address
- Select shipping method and carrier
- Add order notes and special instructions
- Calculate order totals (optional pricing integration)

**F-SO-002: Order Validation**
- Validate product availability
- Check inventory levels
- Flag backorders or partial fulfillment
- Validate shipping address
- Prevent duplicate orders

**F-SO-003: Order Management**
- View list of all sales orders with filters
- Search orders by number, customer, date, status
- Edit orders (before picking starts)
- Cancel orders
- Track order status (pending, allocated, picking, picked, packing, packed, shipped, delivered, cancelled)

**F-SO-004: Order Prioritization**
- Set order priority levels
- Support rush orders
- Sort pick lists by priority
- Display priority indicators

**F-SO-005: Backorder Management**
- Automatically flag backordered items
- Track backorder quantities
- Notify when backorder inventory arrives
- Support partial shipments or hold entire order

### 6.9 Picking Module

**F-PK-001: Pick List Generation**
- Generate pick lists from sales orders
- Support single-order picking
- Support batch picking (multiple orders)
- Support wave picking (by zone or time window)
- Optimize pick sequence by location
- Assign pick lists to pickers

**F-PK-002: Pick Task Management**
- Display assigned pick tasks to pickers
- Show pick location, product, and quantity
- Support mobile device interface
- Allow pickers to accept or defer tasks
- Track pick task status (pending, in progress, completed, short pick)

**F-PK-003: Picking Execution**
- Scan location barcode to confirm location
- Scan product barcode to confirm product
- Enter or confirm picked quantity
- Report short picks with reason
- Report damaged items
- Support pick-to-tote or pick-to-cart
- Update inventory in real-time upon pick confirmation

**F-PK-004: Pick Verification**
- Require barcode scan for verification
- Prevent picking wrong product
- Alert on quantity discrepancies
- Support blind picking (quantity not shown)

**F-PK-005: Pick List Completion**
- Mark pick list as complete
- Generate pick completion report
- Route picked items to packing area
- Update order status to "picked"

### 6.10 Packing Module

**F-PC-001: Packing Queue**
- Display orders ready for packing
- Prioritize packing queue
- Assign orders to packers
- Show packing instructions

**F-PC-002: Packing Execution**
- Verify picked items against order
- Scan items to confirm inclusion in package
- Select packaging materials
- Enter package dimensions and weight
- Support multiple packages per order
- Add packing materials to package record

**F-PC-003: Packing Slip & Label Generation**
- Generate packing slips
- Print shipping labels with carrier integration
- Print barcode labels for packages
- Include order details and customer information

**F-PC-004: Special Handling**
- Flag orders requiring special packaging
- Support gift wrapping or custom packaging
- Include promotional materials or inserts
- Handle hazardous materials labeling

**F-PC-005: Packing Completion**
- Mark order as packed
- Move package to shipping area
- Update order status
- Generate packing report

### 6.11 Shipping Module

**F-SH-001: Shipment Creation**
- Create shipments from packed orders
- Consolidate multiple orders into one shipment
- Select carrier and service level
- Enter tracking numbers
- Set ship date

**F-SH-002: Carrier Integration**
- Integrate with major carriers (UPS, FedEx, USPS, DHL)
- Generate shipping labels via carrier API
- Retrieve real-time shipping rates
- Track shipments via carrier API
- Support carrier pickup scheduling

**F-SH-003: Shipping Verification**
- Scan packages to load onto shipment
- Verify package count
- Verify weight and dimensions
- Generate bill of lading
- Create shipping manifest

**F-SH-004: Shipment Dispatch**
- Mark shipment as dispatched
- Record actual ship date and time
- Update order status to "shipped"
- Send tracking notification to customer (optional)
- Generate shipping reports

**F-SH-005: Shipment Tracking**
- View all shipments with filters
- Track shipment status
- View delivery confirmation
- Handle delivery exceptions
- Generate shipment history reports

### 6.12 Returns Management Module

**F-RT-001: Return Authorization**
- Create RMA from original order
- Specify return reason
- Select items and quantities to return
- Set return instructions
- Generate RMA number and documentation

**F-RT-002: Return Receipt**
- Receive returned items against RMA
- Inspect returned items
- Record item condition
- Capture photos of returned items

**F-RT-003: Return Disposition**
- Route items based on condition (restock, quarantine, scrap, return to supplier)
- Update inventory for restocked items
- Create inventory adjustment for scrapped items
- Generate return reports

**F-RT-004: Return Processing**
- Track return status
- Link returns to refunds or replacements
- Generate return analytics
- Monitor return rates by product or customer

### 6.13 Cycle Count Module

**F-CC-001: Cycle Count Planning**
- Create cycle count schedules
- Support ABC analysis for count frequency
- Select locations or products to count
- Assign counts to users
- Set count dates and priorities

**F-CC-002: Cycle Count Execution**
- Display assigned cycle counts
- Navigate to count locations
- Enter counted quantities
- Support blind counts (system quantity hidden)
- Flag missing or unexpected items
- Support mobile device interface

**F-CC-003: Variance Analysis**
- Calculate variances between counted and system quantities
- Highlight significant discrepancies
- Calculate inventory accuracy percentage
- Generate variance reports

**F-CC-004: Recount Process**
- Trigger recount for variances exceeding threshold
- Assign recount to different user
- Compare recount results
- Escalate persistent discrepancies

**F-CC-005: Count Reconciliation**
- Review and approve inventory adjustments
- Investigate root causes of variances
- Update inventory records
- Generate cycle count completion reports
- Track cycle count history and trends

### 6.14 Transfer Management Module

**F-TR-001: Transfer Order Creation**
- Create transfer orders between locations, zones, or warehouses
- Specify source and destination
- Add products and quantities
- Provide transfer reason
- Set requested transfer date

**F-TR-002: Transfer Approval**
- Route transfer for approval if required
- Approve or reject with comments
- Track approval status

**F-TR-003: Transfer Execution**
- Generate pick task for source location
- Pick items from source
- Decrement inventory at source
- Mark items as in-transit
- Receive items at destination
- Increment inventory at destination

**F-TR-004: Transfer Tracking**
- View all transfer orders with filters
- Track transfer status
- Generate transfer reports
- Monitor inter-warehouse transfers

### 6.15 Reporting & Analytics Module

**F-RA-001: Inventory Reports**
- Current inventory levels by product, location, warehouse
- Inventory valuation reports
- Inventory aging reports
- Slow-moving and obsolete inventory
- Stock level forecasts
- Reorder recommendations

**F-RA-002: Operational Reports**
- Receiving reports (daily, weekly, monthly)
- Shipping reports with order fulfillment metrics
- Pick accuracy and productivity reports
- Packing efficiency reports
- Order cycle time reports
- Returns analysis reports

**F-RA-003: Accuracy Reports**
- Inventory accuracy metrics
- Cycle count results and trends
- Adjustment frequency and reasons
- Discrepancy analysis

**F-RA-004: Performance Dashboards**
- Real-time operational dashboard
- Key performance indicators (KPIs)
- Order fulfillment rate
- On-time shipping percentage
- Inventory turnover ratio
- Warehouse utilization metrics

**F-RA-005: Custom Reports**
- Report builder for custom queries
- Export reports to PDF, Excel, CSV
- Schedule automated report generation
- Email reports to stakeholders

**F-RA-006: Analytics**
- Trend analysis over time
- Comparative analysis (period over period)
- Product performance analysis
- Supplier performance metrics
- Customer order patterns

### 6.16 Alerts & Notifications Module

**F-AN-001: Inventory Alerts**
- Low stock alerts based on reorder points
- Out-of-stock notifications
- Expiring product alerts
- Slow-moving inventory notifications
- Overstock warnings

**F-AN-002: Operational Alerts**
- Overdue purchase orders
- Pending approvals
- Unassigned pick tasks
- Shipment delays
- Receiving discrepancies

**F-AN-003: System Notifications**
- Task assignments
- Status changes
- Approval requests
- Error notifications
- Integration failures

**F-AN-004: Notification Delivery**
- In-app notifications
- Email notifications
- SMS notifications (optional)
- Configurable notification preferences per user
- Notification history and read status

### 6.17 Mobile Application Module

**F-MA-001: Mobile Interface**
- Responsive mobile web interface or native app
- Optimized for handheld scanners and tablets
- Barcode scanning capability
- Offline mode with sync capability

**F-MA-002: Mobile Receiving**
- Receive shipments on mobile device
- Scan barcodes for products and locations
- Capture photos
- Complete put-away

**F-MA-003: Mobile Picking**
- View and accept pick tasks
- Navigate to pick locations
- Scan to pick
- Report issues

**F-MA-004: Mobile Cycle Counting**
- Execute cycle counts on mobile device
- Scan locations and products
- Enter counted quantities
- Submit counts

**F-MA-005: Mobile Inventory Lookup**
- Search for products
- View inventory levels and locations
- View product details

### 6.18 Integration Module

**F-IN-001: API Access**
- RESTful API for external system integration
- API authentication and authorization
- API rate limiting
- API documentation

**F-IN-002: ERP Integration**
- Sync products, customers, suppliers
- Import sales orders
- Export shipment confirmations
- Sync inventory levels

**F-IN-003: E-commerce Integration**
- Import orders from e-commerce platforms
- Update order status
- Sync inventory availability
- Send tracking information

**F-IN-004: Carrier Integration**
- Generate shipping labels
- Retrieve shipping rates
- Track shipments
- Schedule pickups

**F-IN-005: Data Import/Export**
- Bulk import products, locations, inventory
- Export data for external analysis
- Support CSV, Excel, XML, JSON formats
- Data validation on import

## 7. Business Rules

### 7.1 Inventory Rules

**BR-INV-001: Negative Inventory Prevention**
- System must prevent inventory from going negative
- Picks cannot exceed available inventory
- Adjustments that would result in negative inventory require special override permission

**BR-INV-002: Allocation Rules**
- Allocated inventory is reserved and unavailable for other orders
- Allocations are released if order is cancelled
- Allocations expire after configurable time period if not fulfilled

**BR-INV-003: FIFO/FEFO Enforcement**
- For lot-tracked items, system enforces First-Expired-First-Out (FEFO) by default
- For non-lot-tracked items, system enforces First-In-First-Out (FIFO)
- Override requires manager approval

**BR-INV-004: Lot/Batch Consistency**
- All items in a lot/batch must have the same expiration date
- Lot/batch numbers must be unique per product
- Expired lots cannot be picked without override

**BR-INV-005: Serial Number Uniqueness**
- Serial numbers must be unique across the entire system
- Serial numbers cannot be reused
- Serial-tracked items require serial number at receipt and pick

**BR-INV-006: Location Capacity**
- System warns when location capacity is exceeded
- Locations can be marked as full to prevent additional put-aways
- Capacity can be measured by quantity, weight, or volume

### 7.2 Order Processing Rules

**BR-OP-001: Order Validation**
- Orders cannot be created with invalid or inactive products
- Shipping address must be validated
- Customer must be active

**BR-OP-002: Order Modification**
- Orders can only be modified before picking starts
- Modifications after picking require order cancellation and recreation
- Cancelled orders release allocated inventory immediately

**BR-OP-003: Partial Fulfillment**
- System can be configured to allow or prevent partial shipments
- If partial shipments allowed, remaining items stay on backorder
- If partial shipments not allowed, entire order waits for complete inventory

**BR-OP-004: Order Priority**
- Rush orders are prioritized in pick list generation
- Orders are fulfilled in priority order, then by order date
- Same-day orders have highest priority

**BR-OP-005: Minimum Order Quantity**
- Products can have minimum order quantities
- Orders below minimum require override approval

### 7.3 Receiving Rules

**BR-RC-001: Over-Receipt Tolerance**
- Over-receipts within tolerance percentage (e.g., 5%) are auto-accepted
- Over-receipts exceeding tolerance require manager approval
- Over-receipts update PO expected quantity

**BR-RC-002: Quality Inspection**
- Products marked as requiring inspection must go to quarantine zone
- Quarantined items are not available for picking
- Inspection must be completed before items can be moved to stock

**BR-RC-003: Receipt Completion**
- Receipts cannot be closed with pending put-aways
- All received items must be assigned to locations
- Closed receipts cannot be modified

**BR-RC-004: Damaged Goods**
- Damaged items must be documented with photos and reason codes
- Damaged items are placed in quarantine or damage zone
- Damaged items are not added to available inventory

### 7.4 Picking Rules

**BR-PK-001: Pick Verification**
- Barcode scanning is required for pick verification (configurable)
- Picking wrong product triggers error and prevents completion
- Short picks must include reason code

**BR-PK-002: Pick Task Assignment**
- Pick tasks can only be assigned to users with Picker role
- Users can only work on one pick list at a time
- Pick tasks cannot be reassigned once started without manager approval

**BR-PK-003: Location Accuracy**
- Picker must scan location barcode before picking
- Picking from wrong location triggers warning
- Location discrepancies are logged for investigation

**BR-PK-004: Quantity Verification**
- Picked quantity cannot exceed ordered quantity
- Short picks reduce allocated inventory
- Short picks trigger backorder process

### 7.5 Shipping Rules

**BR-SH-001: Shipment Validation**
- All packages in shipment must be packed and verified
- Shipment weight must be within carrier limits
- Hazardous materials require special documentation

**BR-SH-002: Carrier Selection**
- Carrier is selected based on customer preference, service level, or cost
- Certain products may require specific carriers
- International shipments require customs documentation

**BR-SH-003: Tracking Requirements**
- All shipments must have tracking numbers
- Tracking information must be captured before marking as shipped
- Tracking updates are synced with carrier systems

**BR-SH-004: Shipment Cutoff Times**
- Orders must be packed before carrier cutoff time for same-day shipping
- Orders after cutoff are scheduled for next business day
- Rush orders may have extended cutoff times

### 7.6 Adjustment Rules

**BR-ADJ-001: Adjustment Approval Thresholds**
- Adjustments below threshold (e.g., 10 units or $100) can be auto-approved
- Adjustments above threshold require manager approval
- Adjustments above critical threshold require dual approval

**BR-ADJ-002: Adjustment Reason Codes**
- All adjustments must include reason code
- Reason codes include: damage, loss, theft, found, count correction, expiration
- Custom reason codes can be configured

**BR-ADJ-003: Adjustment Documentation**
- Adjustments above threshold require supporting documentation
- Photos or notes must be attached
- Audit trail is maintained for all adjustments

### 7.7 Cycle Count Rules

**BR-CC-001: Count Frequency**
- A-items (high value/velocity) counted monthly
- B-items counted quarterly
- C-items counted annually
- Full physical inventory at least annually

**BR-CC-002: Count Accuracy**
- Variance threshold for recount (e.g., >2% or >5 units)
- Three consecutive accurate counts improve location accuracy score
- Persistent inaccuracies trigger investigation

**BR-CC-003: Count Timing**
- Locations with pending transactions cannot be counted
- Counts should be performed during low-activity periods
- Locations are locked during counting to prevent transactions

### 7.8 Transfer Rules

**BR-TR-001: Transfer Validation**
- Source location must have sufficient inventory
- Destination location must have capacity
- Inter-warehouse transfers require approval

**BR-TR-002: Transfer Tracking**
- Inventory is marked as in-transit during transfer
- In-transit inventory is not available for allocation
- Transfer must be completed within expected timeframe

### 7.9 User Access Rules

**BR-UA-001: Role-Based Restrictions**
- Users can only perform actions permitted by their role
- Sensitive operations require elevated permissions
- System administrators have full access

**BR-UA-002: Warehouse Assignment**
- Users can only access data for assigned warehouses
- Cross-warehouse operations require special permission
- Warehouse managers have full access to their warehouse

**BR-UA-003: Approval Authority**
- Approval authority is based on role and value thresholds
- Approvers cannot approve their own requests
- Approval history is maintained

### 7.10 Data Integrity Rules

**BR-DI-001: Unique Identifiers**
- SKUs must be unique across the system
- Location codes must be unique within a warehouse
- Order numbers, PO numbers, receipt numbers must be unique and sequential

**BR-DI-002: Required Fields**
- Products must have SKU, name, and base UOM
- Orders must have customer and at least one line item
- Receipts must have supplier or source
- All transactions must have user and timestamp

**BR-DI-003: Referential Integrity**
- Products cannot be deleted if inventory exists
- Locations cannot be deleted if inventory exists
- Customers/suppliers cannot be deleted if orders/POs exist
- Soft delete (mark as inactive) is used instead

**BR-DI-004: Audit Trail**
- All create, update, delete operations are logged
- Audit logs include user, timestamp, old value, new value
- Audit logs are immutable and retained per compliance requirements

## 8. Non-Functional Requirements

### 8.1 Performance Requirements

**NFR-PERF-001: Response Time**
- Page load time: < 2 seconds for standard operations
- Search and filter operations: < 1 second
- Barcode scan processing: < 500ms
- Report generation: < 5 seconds for standard reports, < 30 seconds for complex reports
- API response time: < 500ms for 95% of requests

**NFR-PERF-002: Throughput**
- Support 100+ concurrent users without performance degradation
- Handle 1,000+ transactions per hour
- Process 10,000+ order lines per day
- Support 100+ barcode scans per minute per device

**NFR-PERF-003: Database Performance**
- Database queries optimized with proper indexing
- Complex queries use caching where appropriate
- Database connection pooling implemented
- Query timeout limits enforced

**NFR-PERF-004: Scalability**
- Horizontal scaling capability for application servers
- Database read replicas for reporting and analytics
- Support for multiple warehouses without performance impact
- Ability to handle 10x growth in data volume

### 8.2 Security Requirements

**NFR-SEC-001: Authentication**
- Secure password storage using industry-standard hashing (bcrypt, Argon2)
- Password complexity requirements enforced
- Account lockout after failed login attempts
- Session management with secure tokens
- Optional multi-factor authentication (MFA)

**NFR-SEC-002: Authorization**
- Role-based access control (RBAC) enforced at API and UI levels
- Principle of least privilege applied
- Permission checks on all sensitive operations
- Audit logging of authorization failures

**NFR-SEC-003: Data Protection**
- Encryption at rest for sensitive data
- Encryption in transit (TLS 1.2 or higher)
- Secure API keys and credentials storage
- PII data protection compliance (GDPR, CCPA)

**NFR-SEC-004: API Security**
- API authentication using tokens (JWT or OAuth 2.0)
- API rate limiting to prevent abuse
- Input validation and sanitization
- Protection against common vulnerabilities (SQL injection, XSS, CSRF)

**NFR-SEC-005: Audit & Compliance**
- Comprehensive audit logging of all user actions
- Tamper-proof audit logs
- Audit log retention per compliance requirements
- Regular security assessments and penetration testing

### 8.3 Reliability & Availability

**NFR-REL-001: Uptime**
- System availability: 99.5% uptime (excluding planned maintenance)
- Planned maintenance windows communicated in advance
- Maximum unplanned downtime: 4 hours per month

**NFR-REL-002: Data Backup**
- Automated daily backups of all data
- Backup retention: 30 days for daily, 12 months for monthly
- Backup verification and test restores performed regularly
- Offsite backup storage for disaster recovery

**NFR-REL-003: Disaster Recovery**
- Recovery Time Objective (RTO): 4 hours
- Recovery Point Objective (RPO): 24 hours
- Documented disaster recovery procedures
- Annual disaster recovery testing

**NFR-REL-004: Error Handling**
- Graceful error handling with user-friendly messages
- Automatic retry for transient failures
- Error logging for troubleshooting
- Alerting for critical errors

### 8.4 Usability Requirements

**NFR-USE-001: User Interface**
- Intuitive and consistent UI design
- Responsive design supporting desktop, tablet, and mobile devices
- Accessibility compliance (WCAG 2.1 Level AA)
- Support for multiple languages (internationalization)

**NFR-USE-002: Mobile Experience**
- Touch-optimized interface for mobile devices
- Large buttons and input fields for warehouse environment
- Support for barcode scanners (Bluetooth, USB, camera)
- Offline capability with automatic sync when online

**NFR-USE-003: User Assistance**
- Contextual help and tooltips
- User documentation and training materials
- Video tutorials for common workflows
- In-app onboarding for new users

**NFR-USE-004: Feedback & Confirmation**
- Visual and audible feedback for scans and actions
- Confirmation dialogs for destructive actions
- Progress indicators for long-running operations
- Success and error notifications

### 8.5 Maintainability Requirements

**NFR-MAIN-001: Code Quality**
- Clean, well-documented code following coding standards
- Modular architecture with separation of concerns
- Automated code quality checks (linting, static analysis)
- Code review process for all changes

**NFR-MAIN-002: Testing**
- Unit test coverage: minimum 80%
- Integration tests for critical workflows
- End-to-end tests for key user journeys
- Automated regression testing

**NFR-MAIN-003: Monitoring & Logging**
- Application performance monitoring (APM)
- Real-time error tracking and alerting
- Structured logging with log aggregation
- System health dashboards

**NFR-MAIN-004: Deployment**
- Automated deployment pipeline (CI/CD)
- Blue-green or canary deployment strategy
- Rollback capability for failed deployments
- Database migration management

### 8.6 Compatibility Requirements

**NFR-COMP-001: Browser Support**
- Chrome (latest 2 versions)
- Firefox (latest 2 versions)
- Safari (latest 2 versions)
- Edge (latest 2 versions)

**NFR-COMP-002: Mobile Platforms**
- iOS 13 and above
- Android 8.0 and above
- Support for mobile browsers and native apps

**NFR-COMP-003: Hardware Compatibility**
- Support for common barcode scanners (Zebra, Honeywell, Datalogic)
- Support for label printers (Zebra, Brother, Dymo)
- Support for RFID readers (optional)
- Support for mobile computers and tablets

**NFR-COMP-004: Integration Standards**
- RESTful API following OpenAPI specification
- Support for webhooks for event notifications
- Standard data formats (JSON, XML, CSV)
- EDI support for supplier/carrier integration (optional)

### 8.7 Data Requirements

**NFR-DATA-001: Data Retention**
- Transactional data retained for 7 years
- Audit logs retained per compliance requirements
- Archived data accessible for reporting
- Data purging process for obsolete data

**NFR-DATA-002: Data Migration**
- Support for data import from legacy systems
- Data validation and cleansing during migration
- Rollback capability for failed migrations
- Minimal downtime during migration

**NFR-DATA-003: Data Export**
- Export capability for all major entities
- Support for bulk data export
- Scheduled exports for integration
- Data export audit trail

### 8.8 Compliance Requirements

**NFR-COMP-001: Regulatory Compliance**
- FDA compliance for pharmaceutical warehouses (21 CFR Part 11)
- HACCP compliance for food warehouses
- Hazardous materials handling compliance (OSHA, DOT)
- Industry-specific compliance as required

**NFR-COMP-002: Data Privacy**
- GDPR compliance for EU customers
- CCPA compliance for California customers
- Data subject rights (access, deletion, portability)
- Privacy policy and terms of service

**NFR-COMP-003: Financial Compliance**
- SOX compliance for inventory valuation (if applicable)
- Audit trail for financial transactions
- Segregation of duties for financial operations

### 8.9 Operational Requirements

**NFR-OPS-001: Support**
- Technical support during business hours
- Issue tracking and resolution SLAs
- Knowledge base and FAQ
- User community forum

**NFR-OPS-002: Training**
- Initial training for administrators and users
- Training materials and documentation
- Ongoing training for new features
- Train-the-trainer programs

**NFR-OPS-003: Upgrades**
- Regular feature updates and enhancements
- Security patches applied promptly
- Backward compatibility maintained
- Upgrade notifications and release notes

---

**Document Version:** 1.0  
**Last Updated:** 2025-01-10  
**Document Owner:** Product Management  
**Status:** Final