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The PO_LINE_LOCATIONS_GT table in Oracle E-Business Suite (EBS) 12.1.1 or 12.2.2 is a global temporary table used primarily within the Purchasing (PO) module to temporarily store line location data during complex procurement transactions. This table plays a critical role in processing purchase order (PO) line shipments, ensuring data integrity during bulk operations, and facilitating intermediate calculations before final commitment to permanent tables like PO_LINE_LOCATIONS_ALL. Below is a detailed analysis of its structure, purpose, and usage:

1. Purpose and Functionality

The PO_LINE_LOCATIONS_GT table acts as a transient repository for line location records during PO creation, modification, or approval workflows. Key use cases include:
  • Bulk Processing: Temporarily holds shipment-level data (e.g., quantities, dates, prices) during batch operations like mass PO imports or updates.
  • Data Validation: Facilitates intermediate validation checks (e.g., accrual accounting, tax calculations) before persisting data to permanent tables.
  • Workflow Support: Used in approval workflows to stage changes until authorized.

2. Table Structure

The table mirrors the schema of PO_LINE_LOCATIONS_ALL but lacks indexes/constraints for performance optimization. Key columns include:
  • LINE_LOCATION_ID: Temporary PK for reference during processing.
  • PO_HEADER_ID/PO_LINE_ID: Links to parent PO records.
  • SHIPMENT_TYPE: Distinguishes between standard, planned, or blanket shipments.
  • QUANTITY/PRICE: Stores provisional values during calculations.
  • NEED_BY_DATE/PROMISED_DATE: Critical for scheduling validations.
  • TAX/ACCRUAL_FLAGS: Temporary flags for downstream processing.

3. Technical Implementation

  • Session Isolation: As a global temporary table, data is visible only to the session that inserts it, ensuring concurrency safety.
  • Transaction Scope: Configured for transaction-level persistence (default) or session-level, depending on EBS setup.
  • Performance: Optimized for high-volume operations by avoiding redo/undo logging overhead.

4. Integration Points

The table interacts with:
  • PO_API_PROCESSING: Core PL/SQL APIs use it to validate and transform data before committing.
  • Import Programs: Tools like POXCONCT (Concurrent PO Import) leverage it for staging.
  • Custom Extensions: Developers may use it in custom workflows to avoid direct DML on permanent tables.

5. Key Considerations

  • Data Lifespan: Records are automatically purged at transaction/session end—no manual cleanup needed.
  • Debugging: Enabling trace logs for PO modules can help troubleshoot issues during GT table usage.
  • Customization Impact: Modifications to permanent tables may require parallel adjustments to GT table logic.

6. Example Workflow

During PO creation:
  1. Data enters via UI/API/import and populates PO_LINE_LOCATIONS_GT.
  2. Validations execute (e.g., quantity vs. min/max tolerances).
  3. Approval workflows reference the GT table for checks.
  4. Upon final submission, data moves to PO_LINE_LOCATIONS_ALL.
In summary, PO_LINE_LOCATIONS_GT is a foundational component in Oracle EBS Purchasing, enabling scalable, transaction-safe processing of PO shipments while maintaining data consistency. Its design reflects Oracle's best practices for temporary data handling in high-volume ERP environments.