How To Fix /SCWM/TO_WHR_UPD011 - Warehouse request &1 could not be locked

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/TO_WHR_UPD -

• Message number: 011

• Message text: Warehouse request &1 could not be locked

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCWM/TO_WHR_UPD011 - Warehouse request &1 could not be locked ?

  The SAP error message /SCWM/TO_WHR_UPD011 indicates that a warehouse request (TO - Transfer Order) could not be locked for processing. This typically occurs in the context of the Extended Warehouse Management (EWM) module when multiple processes or users are trying to access or modify the same warehouse request simultaneously.
  Causes:
  
  Concurrent Access: Another user or process is currently accessing or modifying the same warehouse request, leading to a lock conflict.
  Long-running Transactions: A transaction that takes too long to complete may hold a lock on the warehouse request, preventing others from accessing it.
  System Performance Issues: High system load or performance issues can lead to delays in releasing locks.
  Database Locking: Database-level locks may be in place due to other operations that are not releasing locks properly.
  
  Solutions:
  
  Wait and Retry: If the error is due to concurrent access, waiting for a short period and then retrying the operation may resolve the issue.
  Check Active Sessions: Use transaction codes like SM12 (to check for locks) and SM21 (to check system logs) to identify if there are any active sessions holding locks on the warehouse request.
  Identify Long-running Transactions: Use transaction SM66 to monitor active processes and identify any long-running transactions that may be causing the lock.
  Release Locks: If you identify a session that is holding a lock unnecessarily, you may need to release it (with caution) using SM12.
  System Performance Tuning: If the issue is related to system performance, consider optimizing database performance, increasing resources, or reviewing the configuration of the EWM system.
  Consult SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to this error.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM12, SM21, and SM66 for monitoring locks and system performance.
  SAP EWM Documentation: Review the official SAP EWM documentation for best practices on managing warehouse requests and understanding locking mechanisms.
  User Training: Ensure that users are trained on how to properly manage warehouse requests to minimize lock conflicts.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or SAP support for further investigation.