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The PA.PA_ASGMTS_HSTRY_AR table in Oracle E-Business Suite (EBS) versions 12.1.1 and 12.2.2 is a critical data structure within the Project Accounting (PA) module. It serves as an archive table for historical assignment records, capturing changes to project assignments over time. This table is part of Oracle's comprehensive project management and financial tracking system, enabling organizations to maintain audit trails, comply with reporting requirements, and analyze historical assignment data.

Purpose and Functionality

The primary purpose of PA.PA_ASGMTS_HSTRY_AR is to store historical snapshots of assignment records that have been modified or deleted from the active assignments table (PA.PA_PROJECT_ASSIGNMENTS). This archival mechanism ensures data integrity and supports regulatory compliance by preserving a complete record of assignment changes, including:
  • Personnel assignments to projects
  • Assignment role changes
  • Date range modifications
  • Percentage allocation adjustments
  • Costing and billing rate updates

Table Structure

The table contains numerous columns that mirror the active assignments table while adding historical tracking fields. Key columns include:
  • ASSIGNMENT_ID: Primary key reference to the original assignment
  • PROJECT_ID: Associated project identifier
  • PERSON_ID: Employee or resource reference
  • START_DATE and END_DATE: Assignment period
  • ASSIGNMENT_TYPE: Classification of the assignment
  • LAST_UPDATE_DATE: Timestamp of the change
  • CREATION_DATE: Original record creation date
  • CHANGE_REASON: Optional field documenting why the change occurred

Integration Points

PA.PA_ASGMTS_HSTRY_AR integrates with several Oracle EBS modules:
  • Human Resources (HR): Links to employee data via PERSON_ID
  • General Ledger (GL): Provides historical cost allocation data
  • Projects Billing: Supports historical billing rate verification
  • Project Costing: Maintains labor cost distribution history

Technical Considerations

Implementation and maintenance of this table requires attention to:
  • Partitioning Strategy: Large implementations may require partitioning by date ranges
  • Purge Processes: Oracle provides standard purge programs to manage table growth
  • Indexing: Proper indexing is critical for reporting performance
  • Space Allocation: The table can grow significantly in organizations with frequent assignment changes

Business Process Impact

The historical data in this table supports:
  • Audit and compliance reporting
  • Project resource utilization analysis
  • Labor cost trending and variance analysis
  • Dispute resolution regarding historical assignments
  • Forecasting based on historical assignment patterns

Customization Considerations

While Oracle provides standard functionality for this table, organizations often:
  • Create custom reports against the historical data
  • Develop extensions to capture additional assignment attributes
  • Implement custom purge retention rules
  • Build interfaces to external analytics platforms

Version-Specific Notes

Between 12.1.1 and 12.2.2, the table structure remained largely consistent, but 12.2.2 introduced:
  • Enhanced partitioning options
  • Improved purge utilities
  • Tighter integration with Oracle Fusion Middleware for reporting
The PA.PA_ASGMTS_HSTRY_AR table represents a critical component of Oracle's project accounting solution, providing organizations with the historical data needed for comprehensive project management, financial control, and regulatory compliance.