How To Fix CCMM151 - Structure gap (&1 &2 &3) is currently locked

SAP Error Message - Details

• Message type: E = Error

• Message class: CCMM - Message Class for A&D CCM

• Message number: 151

• Message text: Structure gap (&1 &2 &3) is currently locked

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CCMM151 - Structure gap (&1 &2 &3) is currently locked ?

  The SAP error message CCMM151 indicates that a structure gap (identified by the parameters &1, &2, and &3) is currently locked. This typically occurs in the context of SAP's Capacity Planning and Production Planning modules, where certain data structures are locked to prevent concurrent modifications that could lead to inconsistencies.
  Cause:
  
  Concurrent Access: The structure gap is being accessed or modified by another user or process, leading to a lock.
  Long-running Transactions: A transaction that is taking too long to complete may hold the lock longer than expected.
  System Errors: Sometimes, system errors or crashes can leave locks in place that are not released properly.
  
  Solution:
  
  Wait and Retry: If the lock is due to another user or process, waiting for a short period and then retrying the operation may resolve the issue.
  Identify the Lock: Use transaction codes like SM12 (to view and manage locks) to identify which user or process is holding the lock. You can check the lock entries and see if they can be released.
  Release the Lock: If you have the necessary authorizations, you can manually delete the lock entry in SM12. However, be cautious with this approach, as it may lead to data inconsistencies if the other process is still running.
  Check for Long-running Jobs: Use transaction SM37 to check for any long-running jobs that might be holding the lock. If you find any, you may need to investigate and possibly terminate them if they are stuck.
  System Restart: In some cases, a system restart may be necessary to clear any lingering locks, but this should be done with caution and typically as a last resort.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: To view and manage lock entries.
  SM37: To monitor background jobs.
  SM21: To check system logs for any related errors.
  
  
  Documentation: Refer to SAP Help documentation for more details on locking mechanisms and best practices for managing locks.
  User Permissions: Ensure that users have the appropriate permissions to access and modify the structure gaps in question.
  
  If the issue persists after trying the above solutions, it may be necessary to consult with your SAP Basis team or SAP support for further assistance.