How To Fix I4646 - Lock data records; lock object &1 (&2)

SAP Error Message - Details

• Message type: E = Error

• Message class: I4 - WCM: Work Clearance Management

• Message number: 646

• Message text: Lock data records; lock object &1 (&2)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message I4646 - Lock data records; lock object &1 (&2) ?

  The SAP error message I4646, which states "Lock data records; lock object &1 (&2)," typically occurs when there is an issue with locking mechanisms in the SAP system. This error is related to the use of lock objects in SAP, which are used to prevent concurrent access to data records by multiple users or processes.
  Cause:
  
  
  Lock Conflicts: The most common cause of this error is that a lock object is already being held by another transaction or user. This can happen if:
  
  A previous transaction did not release the lock properly.
  A long-running transaction is holding the lock for an extended period.
  Multiple users are trying to access the same data simultaneously.
  
  
  
  Deadlocks: In some cases, a deadlock situation may arise where two or more transactions are waiting for each other to release locks.
  
  
  System Performance Issues: If the system is under heavy load, it may take longer for locks to be released, leading to this error.
  
  
  Solution:
  
  
  Identify the Lock: Use transaction code SM12 to check for existing locks. You can see which user or transaction is holding the lock and decide whether to terminate it if necessary.
  
  
  Release Locks: If you find that a lock is being held unnecessarily, you can manually delete the lock entry in SM12. However, be cautious when doing this, as it may lead to data inconsistencies if the transaction holding the lock is still in progress.
  
  
  Optimize Transactions: Review the transactions that are causing the locks. If they are taking too long, consider optimizing the code or breaking them into smaller, more manageable parts.
  
  
  Increase Lock Timeout: If the locks are timing out too quickly, you may consider increasing the lock timeout settings in the system configuration, but this should be done with caution.
  
  
  Check for Deadlocks: If you suspect a deadlock, you may need to analyze the transactions involved and adjust their logic to prevent them from waiting on each other.
  
  
  Consult SAP Notes: Check the SAP Support Portal for any relevant notes or patches that may address known issues related to lock objects.
  
  
  Related Information:
  
  Lock Objects: In SAP, lock objects are defined in the Data Dictionary (SE11) and are used to manage concurrent access to database records.
  Transaction Codes:
  
  SM12: To view and manage lock entries.
  SM21: To check system logs for any related errors or warnings.
  ST22: To analyze dumps that may provide insight into the issue.
  
  
  Performance Monitoring: Use transaction codes like ST03N or ST04 to monitor system performance and identify any bottlenecks that may be contributing to lock issues.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or consult with SAP support for further assistance.