How To Fix /STMC/CR_MSG721 - Error while starting repository UOW; another UOW is already active

SAP Error Message - Details

• Message type: E = Error

• Message class: /STMC/CR_MSG -

• Message number: 721

• Message text: Error while starting repository UOW; another UOW is already active

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /STMC/CR_MSG721 - Error while starting repository UOW; another UOW is already active ?

  The SAP error message /STMC/CR_MSG721 indicates that there is an issue with starting a new Unit of Work (UOW) because another UOW is already active. This typically occurs in the context of SAP's Change Request Management (ChaRM) or when working with transport requests and repositories.
  Cause:
  
  Active UOW: The primary cause of this error is that there is already an active Unit of Work in the system. This can happen if a previous operation has not been completed or has been left hanging.
  System Lock: Sometimes, a system lock or a session that has not been properly closed can lead to this error.
  Concurrency Issues: If multiple users or processes are trying to initiate a UOW simultaneously, it can lead to conflicts.
  
  Solution:
  
  Check Active UOWs: Use transaction codes like SM12 (to check for locks) or SM21 (to check system logs) to identify if there are any active UOWs or locks that need to be resolved.
  Complete or Cancel Active UOW: If you find an active UOW that is no longer needed, you may need to complete or cancel it. This can often be done through the relevant transaction or by using the appropriate function in the Change Request Management.
  Restart the Process: After resolving any active UOWs, try to restart the process that was generating the error.
  Check for Background Jobs: Sometimes, background jobs may be holding onto a UOW. Check the job overview (SM37) to see if any jobs are running that might be causing the issue.
  System Restart: In some cases, a system restart may be necessary to clear any lingering locks or sessions that are causing the issue.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error. SAP frequently releases notes that address known issues.
  Documentation: Review the official SAP documentation for Change Request Management and transport management to understand how UOWs are managed.
  Support: If the issue persists, consider reaching out to SAP support for assistance, especially if this is affecting production systems.
  
  Preventive Measures:
  
  Monitoring: Implement monitoring for UOWs and locks to catch issues before they escalate.
  User Training: Ensure that users are trained on proper procedures for starting and completing UOWs to minimize the risk of conflicts.
  
  By following these steps, you should be able to resolve the /STMC/CR_MSG721 error and prevent it from occurring in the future.