How To Fix CMCL107 - Operation cannot be locked (lock management error)

SAP Error Message - Details

• Message type: E = Error

• Message class: CMCL - Service layer for component allocations

• Message number: 107

• Message text: Operation cannot be locked (lock management error)

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Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CMCL107 - Operation cannot be locked (lock management error) ?

  The SAP error message CMCL107, which states "Operation cannot be locked (lock management error)," typically occurs in the context of SAP's lock management system. This error indicates that the system is unable to acquire a lock on a particular operation or resource, which can lead to issues in processing transactions or executing certain functions.
  Causes:
  
  Lock Table Overflow: The lock table may be full, meaning that there are too many locks currently held, and the system cannot accommodate new ones.
  Deadlocks: Two or more processes may be waiting for each other to release locks, leading to a deadlock situation.
  Long-Running Transactions: A transaction that takes too long to complete may hold locks for an extended period, preventing other transactions from acquiring the necessary locks.
  System Configuration Issues: Incorrect configuration of lock parameters or insufficient resources allocated to the lock management system.
  Database Issues: Problems with the underlying database that affect lock management.
  
  Solutions:
  
  Check Lock Table Status: Use transaction code SM12 to check the current locks in the system. You can identify and delete unnecessary locks if they are no longer needed.
  Monitor Long-Running Transactions: Use transaction code SM66 or SM50 to monitor active processes and identify any long-running transactions that may be holding locks.
  Increase Lock Table Size: If the lock table is frequently full, consider increasing its size. This can be done by adjusting the profile parameters related to lock management (e.g., enque/table_size).
  Review and Optimize Code: If the error is related to custom code or specific transactions, review the code for efficiency and ensure that locks are released promptly after their use.
  Check for Deadlocks: Use transaction code SM21 to check the system log for any deadlock situations and resolve them by terminating one of the processes involved.
  System Restart: In some cases, a system restart may help clear up lock issues, but this should be done with caution and typically as a last resort.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to lock management and the specific error message for any patches or updates that may address the issue.
  SAP Documentation: Review SAP documentation on lock management to understand how locks are handled and best practices for managing them.
  Performance Monitoring: Regularly monitor system performance and lock usage to prevent future occurrences of this error.
  
  If the issue persists after trying the above solutions, it may be necessary to consult with SAP support or your system administrator for further investigation and resolution.