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The PO_DISTRIBUTIONS_GT table in Oracle E-Business Suite (EBS) versions 12.1.1 and 12.2.2 serves as a global temporary table (GTT) designed to temporarily store purchase order (PO) distribution data during complex procurement transactions. As a GTT, it holds session-specific data that is automatically purged at the end of the transaction or session, ensuring transactional integrity and performance optimization. This table is integral to Oracle's Purchasing and Payables modules, particularly for processing multi-distribution POs, requisitions, and invoice matching workflows.

Key Attributes of PO_DISTRIBUTIONS_GT:
1. Session-Specific Storage: Data persists only for the duration of a user session or transaction, eliminating the need for manual cleanup.
2. Structural Alignment: Mirrors the schema of the permanent PO_DISTRIBUTIONS_ALL table, containing columns like PO_DISTRIBUTION_ID, PO_HEADER_ID, QUANTITY_ORDERED, and DESTINATION_TYPE_CODE.
3. Performance Optimization: Reduces contention on permanent tables during bulk operations by staging distribution lines before final commit.
4. Multi-Org Support: Includes ORG_ID for multi-organization access control (MOAC) compliance.

Primary Use Cases:
1. PO Creation/Modification: Temporarily holds distribution lines during PO entry or updates before validation and submission to PO_DISTRIBUTIONS_ALL.
2. Requisition Conversion: Stores distributions when converting requisitions to POs via AutoCreate.
3. Invoice Matching: Facilitates 2-way/3-way matching by caching matched distributions during invoice validation.
4. Mass Processing: Enables bulk operations like blanket agreement releases or PO approvals without locking permanent tables.

Technical Implementation:
The table is instantiated per session using Oracle's GTT mechanism (ON COMMIT PRESERVE ROWS or DELETE ROWS). Key columns include:
- INTERFACE_LINE_ID: Links to source data in interface tables
- DESTINATION_ORGANIZATION_ID: For inventory destinations
- CHARGE_ACCOUNT_ID: GL account mapping
- RATE/AMOUNT: Financial terms
Indexes on PO_HEADER_ID and PO_LINE_ID optimize join operations with other PO tables.

Integration Points:
1. Purchasing Module: Interacts with PO_HEADERS_GT, PO_LINES_GT, and permanent PO tables.
2. Payables: Shares data with AP_INVOICE_DISTRIBUTIONS during invoice matching.
3. Inventory: Coordinates with MTL_SYSTEM_ITEMS for item validations.
4. General Ledger: Validates accounts against GL_CODE_COMBINATIONS.

Customization Considerations:
While Oracle discourages direct modifications to GTTs, extensions can be implemented via:
1. Custom PL/SQL APIs that populate/read the GTT
2. Concurrent programs leveraging the table for custom reporting
3. Triggers on related permanent tables to synchronize critical data
All customizations must account for the temporary nature of the data and session isolation properties.

In summary, PO_DISTRIBUTIONS_GT provides a transactional workspace for PO distribution processing in Oracle EBS, combining the scalability of temporary storage with the structural rigor of permanent tables. Its design reflects Oracle's architectural philosophy of separating transient operational data from persistent business records while maintaining referential integrity across procurement workflows.