How To Fix WX451 - Select the end of the lock

SAP Error Message - Details

• Message type: E = Error

• Message class: WX - Master data maintenance: Plant

• Message number: 451

• Message text: Select the end of the lock

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WX451 - Select the end of the lock ?

  SAP Error Message:
  
  WX451 - Select the end of the lock
  
  Cause:
  The error message WX451 typically occurs in SAP when there is an issue related to lock management during a transaction. Specifically, it indicates that the system is trying to release or select the end of a lock, but the lock handling is inconsistent or incorrect.
  This can happen in scenarios such as:
  
  Attempting to release a lock that was not properly set or has already been released.
  Lock objects are not correctly managed in custom code or standard SAP programs.
  Inconsistent lock handling in update tasks or batch jobs.
  The system expects a lock to be held or released at a certain point, but the lock state does not match.
  
  
  Explanation:
  In SAP, locks are used to prevent concurrent access to the same data records to avoid inconsistencies. The lock mechanism involves:
  
  Setting a lock (enqueue)
  Releasing a lock (dequeue)
  
  The message WX451 arises when the system tries to select or release the "end" of a lock, but the lock is not found or the lock state is invalid.
  
  Solution:
  
  
  Check Lock Handling in Custom Code:
  
  If you have custom developments (user exits, BAdIs, enhancements), review the code where enqueue and dequeue functions are called.
  Ensure that every lock set (enqueue) has a corresponding lock release (dequeue).
  Avoid releasing locks that were never set or already released.
  
  
  
  Debug the Program:
  
  Use the ABAP debugger to trace where the lock is being set and released.
  Check the lock object and the key values used.
  Verify the sequence of lock operations.
  
  
  
  Check for Parallel Processes:
  
  If multiple processes or users are trying to access the same data, ensure proper lock handling.
  Avoid long-running locks that might cause conflicts.
  
  
  
  SAP Notes and Patches:
  
  Search for SAP Notes related to WX451 for your specific module or transaction.
  Apply any relevant patches or corrections.
  
  
  
  Database and System Checks:
  
  Sometimes, database inconsistencies or system issues can cause lock problems.
  Check system logs (SM21), enqueue server status (SM12), and update logs (SM13).
  
  
  
  Transaction SM12:
  
  Use transaction SM12 to check for existing locks.
  Delete any stale or orphaned locks if appropriate (with caution).
  
  
  
  
  Related Information:
  
  Transaction SM12: Display and manage lock entries.
  Function Modules: ENQUEUE_<object>, DEQUEUE_<object> for lock management.
  Lock Objects: Defined in SE11, used to lock specific tables or entries.
  SAP Help: Lock concept documentation.
  Common Scenarios: Batch jobs, update tasks, parallel processing.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Inconsistent or incorrect lock handling; trying to release or select a lock that is invalid or not held.
  
  
  Solution
  Review and correct lock handling in code; check and clear locks in SM12; debug lock operations; apply SAP Notes.
  
  
  Related
  SM12 (lock entries), enqueue/dequeue function modules, SAP Notes, system logs (SM21), update logs (SM13).
  
  
  
  
  If you provide the exact transaction or context where WX451 occurs, I can help with more specific guidance.