How To Fix UR447 - Error when locking the run. No restart possible

SAP Error Message - Details

• Message type: E = Error

• Message class: UR -

• Message number: 447

• Message text: Error when locking the run. No restart possible

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UR447 - Error when locking the run. No restart possible ?

  The SAP error message UR447, which states "Error when locking the run. No restart possible," typically occurs in the context of background job processing or when dealing with batch input sessions. This error indicates that there is an issue with locking mechanisms that prevent the system from executing or restarting a particular job or process.
  Causes:
  
  
  Locking Issues: The error often arises when the system is unable to acquire a lock on a specific resource or job. This can happen if:
  
  Another process is currently holding the lock.
  There is a deadlock situation.
  The lock table is full or has reached its limit.
  
  
  
  Job Status: The job may be in a status that does not allow it to be restarted, such as "Cancelled" or "Finished."
  
  
  Database Issues: Problems with the underlying database, such as connectivity issues or transaction log problems, can also lead to locking errors.
  
  
  Configuration Issues: Incorrect configuration settings in the job scheduling or background processing settings can lead to this error.
  
  
  Solutions:
  
  
  Check Job Status: Verify the status of the job in transaction codes like SM37 (Job Monitoring). If the job is in a problematic state, you may need to delete or manually restart it.
  
  
  Release Locks: Use transaction SM12 to check for and release any locks that may be causing the issue. Look for locks related to the job or process in question and delete them if they are no longer needed.
  
  
  Check for Deadlocks: If you suspect a deadlock, you may need to analyze the system logs or use transaction SM21 to identify any deadlock situations and resolve them.
  
  
  Increase Lock Table Size: If the lock table is full, consider increasing its size. This can be done by adjusting the parameters in the instance profile (e.g., enque/table_size).
  
  
  Review Configuration: Check the configuration settings for background processing and ensure they are set correctly. This includes reviewing job scheduling parameters and ensuring that there are no conflicts.
  
  
  System Restart: In some cases, a system restart may be necessary to clear any persistent locking issues, especially if they are related to system resources.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to UR447 for any specific patches or updates that may address this issue.
  Transaction Codes:
  
  SM37: Job Monitoring
  SM12: Lock Entries
  SM21: System Log
  SM66: Global Work Process Overview
  
  
  Documentation: Review SAP documentation for background processing and locking mechanisms for more detailed insights.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.