How To Fix /SAPAPO/ATP036 - Table &1 locked by user &2; update not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/ATP -

• Message number: 036

• Message text: Table &1 locked by user &2; update not possible

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/ATP036 - Table &1 locked by user &2; update not possible ?

  The SAP error message /SAPAPO/ATP036 Table &1 locked by user &2; update not possible typically occurs in the Advanced Planning and Optimization (APO) module when a specific table is locked by a user, preventing other users or processes from updating it. This can happen during various operations, such as during planning runs, data uploads, or when executing certain transactions.
  Cause:
  
  Table Locking: The table mentioned in the error message is currently locked by another user or process. This can happen if a user is performing a long-running transaction or if a previous transaction did not complete properly.
  Concurrency Issues: Multiple users or processes trying to access or update the same data simultaneously can lead to locking issues.
  System Performance: If the system is under heavy load, it may take longer for transactions to complete, leading to prolonged locks.
  
  Solution:
  
  
  Identify the Lock:
  
  Use transaction code SM12 to view the list of locks in the system. You can filter by the table name and the user who is holding the lock.
  Check if the user holding the lock is still active or if the lock is stale (e.g., due to a session that has crashed).
  
  
  
  Release the Lock:
  
  If the lock is held by a user who is no longer active, you can manually delete the lock entry in SM12. However, be cautious when doing this, as it may lead to data inconsistencies if the user was in the middle of a critical operation.
  If the user is still active, communicate with them to determine if they can complete their transaction or release the lock.
  
  
  
  Retry the Operation: After the lock has been released, retry the operation that caused the error.
  
  
  Monitor and Optimize:
  
  Monitor the system for frequent locking issues and analyze the processes that lead to these locks.
  Consider optimizing long-running transactions or processes to minimize the time tables are locked.
  
  
  
  System Configuration: Review the system configuration and settings related to locking behavior, if necessary.
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: To view and manage lock entries.
  SM21: To check system logs for any related errors or warnings.
  ST22: To check for dumps that might indicate underlying issues.
  
  
  
  Documentation: Refer to SAP Help documentation for more details on table locking and performance tuning in SAP APO.
  
  
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to locking in your version of SAP APO.
  
  
  By following these steps, you should be able to resolve the locking issue and prevent it from recurring in the future.