How To Fix WRF_AT_GENERATE020 - System error locking purchase order &1

WRF_AT_GENERATE020 - Overview

• Message type: E = Error

• Message class: WRF_AT_GENERATE - Messages: Allocation Table Generation RTFASH/Ordering

• Message number: 020

• Message text: System error locking purchase order &1

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WRF_AT_GENERATE020 - System error locking purchase order &1 ?

  The SAP error message:
  WRF_AT_GENERATE020: System error locking purchase order &1
  
  
  Cause:
  This error occurs when the system tries to lock a purchase order (PO) during a transaction or background process but fails. Locking is essential to prevent simultaneous changes to the same PO by multiple users or processes. The failure to lock the PO can be caused by:
  
  The PO is already locked by another user or process.
  A previous lock was not released properly due to a system crash or incomplete transaction.
  Deadlocks or lock wait timeouts in the SAP enqueue (locking) system.
  Issues with the enqueue server or lock table corruption.
  Network or system performance problems causing delays in lock handling.
  
  
  
  Solution:
  To resolve the error, consider the following steps:
  
  
  Check for existing locks:
  
  Use transaction SM12 to check if the PO is locked.
  If a lock exists and is no longer needed (e.g., from a crashed session), you can delete the lock manually from SM12 after confirming no active