How To Fix PU623 - Changes to system &2 locked; request was &1

SAP Error Message - Details

• Message type: E = Error

• Message class: PU - Upgrade and Transport Log Messages

• Message number: 623

• Message text: Changes to system &2 locked; request was &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message PU623 - Changes to system &2 locked; request was &1 ?

  The SAP error message PU623 indicates that there are changes being attempted in the system that are currently locked. This typically occurs when a request is being processed, and another user or process has locked the system for changes. Here’s a breakdown of the cause, potential solutions, and related information for this error:
  Cause:
  
  Locking Mechanism: SAP uses a locking mechanism to prevent simultaneous changes to the same data. If one user or process is making changes, other users will be unable to make changes until the lock is released.
  Long-running Transactions: If a transaction takes too long to complete, it can hold locks longer than expected, causing other users to encounter this error.
  Background Jobs: Sometimes, background jobs may lock certain objects while they are being processed.
  User Sessions: If a user has multiple sessions open and is trying to make changes in one while another session is still processing, this can lead to locking issues.
  
  Solution:
  
  Wait and Retry: Often, the simplest solution is to wait for the lock to be released. This can happen automatically once the user or process holding the lock completes their transaction.
  Identify the Lock: Use transaction codes like SM12 (for lock entries) to identify which user or process is holding the lock. You can then communicate with that user or check the status of the process.
  Release the Lock: If you have the necessary authorizations, you can manually release the lock from SM12. However, this should be done with caution, as it may lead to data inconsistencies if the other process is still running.
  Check Background Jobs: Use transaction SM37 to check for any background jobs that might be causing the lock. If a job is stuck, you may need to terminate it.
  Optimize Transactions: If this error occurs frequently, consider reviewing and optimizing the transactions that are causing locks to ensure they complete more quickly.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM37: Monitor background jobs.
  SM21: Check system logs for any related issues.
  
  
  Documentation: Refer to SAP Help documentation for more details on locking mechanisms and best practices for managing locks.
  User Communication: If you identify a user holding a lock, communicate with them to understand if they can release the lock or if they are experiencing issues.
  
  Best Practices:
  
  Encourage users to log off or close sessions when they are not in use to minimize unnecessary locks.
  Regularly monitor and optimize long-running transactions to reduce the likelihood of locks.
  Implement proper error handling in custom programs to manage locks more effectively.
  
  By following these steps, you should be able to resolve the PU623 error and minimize its occurrence in the future.