How To Fix /SCWM/MFS090 - Unable to lock handling unit &1 while determining warehouse task

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/MFS -

• Message number: 090

• Message text: Unable to lock handling unit &1 while determining warehouse task

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCWM/MFS090 - Unable to lock handling unit &1 while determining warehouse task ?

  The SAP error message /SCWM/MFS090 Unable to lock handling unit &1 while determining warehouse task typically occurs in the context of the SAP Extended Warehouse Management (EWM) system, particularly when dealing with handling units (HUs) and warehouse tasks (WTs). This error indicates that the system is unable to lock a specific handling unit (identified by &1) while trying to create or determine a warehouse task.
  Causes:
  
  Concurrent Access: The handling unit may be locked by another process or user. This can happen if multiple users or processes are trying to access or modify the same handling unit simultaneously.
  System Configuration: There may be issues with the configuration of the warehouse management system, such as incorrect settings for handling unit management or warehouse task creation.
  Database Locking: The database may have a lock on the handling unit due to a long-running transaction or a deadlock situation.
  Incomplete Transactions: If a previous transaction involving the handling unit was not completed properly, it may still hold a lock on the HU.
  
  Solutions:
  
  Check for Locks: Use transaction codes like SM12 (for lock entries) to check if there are any active locks on the handling unit. If you find a lock that is no longer needed, you can delete it (if you have the necessary authorizations).
  Wait and Retry: If the lock is due to another user or process, you may need to wait for that process to complete and then retry the operation.
  Review Configuration: Ensure that the configuration settings for handling units and warehouse tasks are correct. This may involve checking the settings in the EWM configuration.
  Monitor Long-Running Transactions: Use transaction codes like SM66 (global work process overview) to identify any long-running transactions that may be causing locks.
  Check for Errors in Previous Transactions: Investigate if there were any errors in previous transactions that involved the handling unit. Correct any issues found.
  System Restart: In some cases, a system restart may be necessary to clear any persistent locks that are not being released.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Documentation: Review the SAP EWM documentation for best practices on handling units and warehouse tasks.
  Support: If the issue persists, consider reaching out to SAP support for assistance, providing them with detailed information about the error and the context in which it occurs.
  
  By following these steps, you should be able to diagnose and resolve the issue related to the error message /SCWM/MFS090.