How To Fix WM123 - Module & is locked for the exclusive use of user &

SAP Error Message - Details

• Message type: E = Error

• Message class: WM - IS-R Assortments

• Message number: 123

• Message text: Module & is locked for the exclusive use of user &

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WM123 - Module & is locked for the exclusive use of user & ?

  The SAP error message WM123 indicates that a specific module in the Warehouse Management (WM) system is locked for exclusive use by a particular user. This typically occurs when a user is performing a transaction that requires exclusive access to a module, and another user is trying to access the same module simultaneously.
  Cause:
  
  Exclusive Locking: The module is locked because a user is currently processing a transaction that requires exclusive access. This can happen during activities like inventory management, stock transfers, or other warehouse operations.
  Long-running Transactions: If a transaction takes too long to complete, it can hold the lock longer than expected, preventing other users from accessing the module.
  Session Issues: Sometimes, a user may have an open session that is not properly closed, leading to a lock on the module.
  System Errors: Occasionally, system errors or crashes can leave a module in a locked state.
  
  Solution:
  
  Wait and Retry: If the lock is due to another user, the simplest solution is to wait until the other user completes their transaction. You can check with the user to see if they are still working on it.
  Identify the Locking User: Use transaction codes like SM12 (for lock entries) to identify which user is holding the lock. You can then communicate with that user to understand the situation.
  Release the Lock: If necessary and if you have the appropriate authorizations, you can manually release the lock from transaction SM12. However, this should be done with caution, as it may disrupt the other user's transaction.
  Check for Long-running Transactions: Investigate if there are any long-running transactions that need to be optimized or completed.
  Session Management: Ensure that users properly log off or close their sessions to avoid unnecessary locks.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as:
  
  SM12: To view and manage lock entries.
  SM21: To check system logs for any errors or issues.
  ST22: To analyze dumps that may indicate underlying issues.
  
  
  User Communication: Encourage users to communicate when they are working on critical transactions that may lock modules.
  System Performance: Regularly monitor system performance and transaction times to identify potential bottlenecks that could lead to locking issues.
  
  If the problem persists or if you are unsure about releasing locks, it may be best to consult with your SAP Basis team or system administrator for further assistance.