How To Fix UR156 - The selected data source is locked by another process

SAP Error Message - Details

• Message type: E = Error

• Message class: UR -

• Message number: 156

• Message text: The selected data source is locked by another process

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UR156 - The selected data source is locked by another process ?

  The SAP error message UR156, which states "The selected data source is locked by another process," typically occurs when a data source in SAP is being accessed or modified by another user or process, preventing your current session from accessing it. This can happen in various SAP modules, particularly in reporting or data extraction scenarios.
  Causes:
  
  Concurrent Access: Another user or process is currently using the data source, which locks it for other users.
  Long-Running Processes: A background job or a long-running transaction may be holding the lock on the data source.
  System Configuration: Certain configurations in the SAP system may lead to locking mechanisms that prevent access to data sources.
  Incomplete Transactions: If a previous transaction did not complete properly, it may leave the data source in a locked state.
  
  Solutions:
  
  Wait and Retry: If the lock is temporary, waiting for a few moments and then retrying the operation may resolve the issue.
  Identify the Lock: Use transaction codes like SM12 (for lock entries) to identify which user or process is holding the lock on the data source. You can then communicate with that user or wait for their process to complete.
  Release the Lock: If you have the necessary authorizations, you can manually delete the lock entry in SM12. However, this should be done with caution, as it may disrupt the other user's work.
  Check Background Jobs: Use transaction SM37 to check for any background jobs that might be running and holding the lock. If you find any, you may need to wait for them to complete or contact the responsible team.
  System Restart: In some cases, a system restart may be necessary to clear any persistent locks, but this should be done as a last resort and typically requires coordination with your SAP Basis team.
  Consult Documentation: Review SAP notes or documentation related to the specific data source or module you are working with, as there may be known issues or additional troubleshooting steps.
  
  Related Information:
  
  SAP Notes: Check SAP's support portal for any relevant notes or updates regarding this error message.
  User Permissions: Ensure that you have the appropriate permissions to access the data source.
  System Performance: Monitor system performance and load, as high usage can lead to more frequent locking issues.
  Training and Best Practices: Educate users on best practices for accessing shared resources to minimize locking conflicts.
  
  If the issue persists after trying the above solutions, it may be beneficial to reach out to your SAP support team for further assistance.