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How To Fix WRF_AT124 - System error while accessing already read allocation table data


SAP Error Message - Details

  • Message type: E = Error

  • Message class: WRF_AT - Messages for Allocation Table RTFASH

  • Message number: 124

  • Message text: System error while accessing already read allocation table data

  • Show details Hide details
  • What causes this issue?

    The system cannot find the data record in table GT_AUPO_DB, although it
    was already copied from table GT_AUPO_DB_ALL.
    The problem involves allocation table &V1&, item &V2&, which is
    referenced by purchase order &V3&, item &V4&.

    System Response

    The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

    How to fix this error?

    Check the relationship between the named allocation table item and the
    purchase order item.

    Procedure for System Administrators


    Error message extract from SAP system. Copyright SAP SE.


Smart SAP Assistant

  • What is the cause and solution for SAP error message WRF_AT124 - System error while accessing already read allocation table data ?

    SAP Error Message:
    WRF_AT124: System error while accessing already read allocation table data


    Cause:

    This error typically occurs in SAP Workflow Runtime (WRF) when the system tries to access or manipulate allocation table data that has already been read or processed. The allocation table is used internally by the workflow engine to manage task assignments and resource allocations.

    Common causes include:

    • Data inconsistency or corruption in the workflow allocation tables.
    • Concurrent access conflicts where multiple processes try to read/write the same allocation data simultaneously.
    • Incomplete or failed workflow tasks that leave the allocation table in an inconsistent state.
    • Custom code or enhancements that improperly handle allocation table data.
    • Issues during workflow runtime or task reassignments.

    Solution:

    1. Check for Workflow Inconsistencies:

      • Use transaction SWI1 (Workflow Log) to identify any errors or stuck workflows.
      • Use transaction SWU_OBUF to check the workflow buffer consistency.
      • Run SWU_REPAIR to repair inconsistencies in the workflow runtime environment.
    2. Database Consistency Checks:

      • Check the allocation tables (e.g., SWWALLOC, SWWUSER, SWWLOGH) for inconsistencies or locks.
      • Use standard SAP tools or report programs to verify and clean up workflow tables.
    3. Lock and Buffer Issues:

      • Sometimes, stale locks or buffer inconsistencies cause this error.
      • Restart the SAP Work Process or clear the workflow buffer using transaction SWU_OBUF ? "Reset Buffer".
    4. Review Custom Code:

      • If there are any custom workflow enhancements or user-exits that manipulate allocation data, review them for proper handling and error management.
    5. SAP Notes and Patches:

      • Search for relevant SAP Notes related to WRF_AT124.
      • Apply any recommended patches or support packages that address workflow runtime errors.
    6. System Restart:

      • In some cases, a system or instance restart may clear transient issues related to locks or buffers.

    Related Information:

    • Workflow Allocation Tables:

      • SWWALLOC – Allocation table for workflow tasks.
      • SWWUSER – User-related workflow data.
      • SWWLOGH – Workflow log header.
    • Transactions:

      • SWI1 – Workflow log display.
      • SWU_OBUF – Workflow buffer administration.
      • SWU_REPAIR – Workflow repair tool.
      • SWI2_FREQ – Workflow runtime analysis.
    • SAP Notes:

      • Check SAP Support Portal for notes mentioning WRF_AT124 or workflow allocation errors.
      • Example notes might include fixes for workflow runtime errors or buffer inconsistencies.

    Summary:

    The WRF_AT124 error indicates a system-level problem accessing workflow allocation data, often due to data inconsistencies, locking conflicts, or buffer issues. The resolution involves checking workflow logs, repairing inconsistencies, clearing buffers, reviewing custom code, and applying SAP patches.

    If the problem persists after these steps, consider raising a support ticket with SAP, providing workflow logs and system traces for detailed analysis.

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