How To Fix /SAPAPO/LCM202 - SNP master data queue is locked; queue update is skipped

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/LCM -

• Message number: 202

• Message text: SNP master data queue is locked; queue update is skipped

Self-Explanatory Message

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• What is the cause and solution for SAP error message /SAPAPO/LCM202 - SNP master data queue is locked; queue update is skipped ?

  The SAP error message /SAPAPO/LCM202 SNP master data queue is locked; queue update is skipped typically occurs in the context of SAP Advanced Planning and Optimization (APO), specifically within the Supply Network Planning (SNP) module. This error indicates that the master data queue for SNP is currently locked, preventing updates from being processed.
  Cause:
  
  
  Locking Mechanism: The SNP master data queue can be locked due to various reasons, such as:
  
  Another process or transaction is currently updating the master data.
  A previous transaction did not complete successfully, leaving the queue in a locked state.
  System maintenance or background jobs that are running and have not yet released the lock.
  
  
  
  Concurrency Issues: Multiple users or processes trying to access or update the same master data simultaneously can lead to locking issues.
  
  
  Long-running Transactions: If a transaction takes too long to complete, it may hold the lock longer than expected, causing subsequent updates to be skipped.
  
  
  Solution:
  
  
  Identify the Lock:
  
  Use transaction code SM12 to check for locks in the system. Look for entries related to the SNP master data queue.
  Identify the user or process that is holding the lock.
  
  
  
  Release the Lock:
  
  If you find a lock that is no longer needed (e.g., a user session that has been terminated), you can manually delete the lock entry in SM12.
  Ensure that you have the necessary authorizations to do this and that it is safe to remove the lock.
  
  
  
  Check Background Jobs:
  
  Review any background jobs that may be running and holding the lock. You can use transaction SM37 to monitor job statuses.
  If a job is taking too long, consider stopping it if it is safe to do so.
  
  
  
  Retry the Operation:
  
  After releasing the lock, retry the operation that caused the error.
  
  
  
  System Monitoring:
  
  Implement monitoring for long-running transactions and locks to prevent future occurrences.
  Consider optimizing processes that frequently cause locks.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: To view and manage lock entries.
  SM37: To monitor background jobs.
  SNC1: To check the status of the SNP master data queue.
  
  
  
  Documentation: Refer to SAP Help documentation for more details on SNP and master data management.
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to this error message or provide patches and updates.
  
  
  Performance Tuning: If locking issues are frequent, consider reviewing the overall performance of your APO system and optimizing data processing workflows.
  
  
  By following these steps, you should be able to resolve the locking issue and prevent it from recurring in the future.