How To Fix CUIB1021 - Instance &1 is locked

SAP Error Message - Details

• Message type: E = Error

• Message class: CUIB1 -

• Message number: 021

• Message text: Instance &1 is locked

What causes this issue?

The instance <(>&<)>v1& is currently locked by another process that
updates the instance.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Try making the changes again at a later point in time.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CUIB1021 - Instance &1 is locked ?

  The SAP error message CUIB1021, which states "Instance &1 is locked," typically occurs when a specific instance (such as a user session, a background job, or a particular resource) is locked and cannot be accessed or modified. This can happen for various reasons, including:
  Causes:
  
  User Lock: A user may have an active session that is locking the instance.
  Background Jobs: A background job may be running and holding a lock on the instance.
  Transaction Errors: An error in a transaction may have left the instance in a locked state.
  Database Locks: Locks at the database level can also lead to this error.
  System Maintenance: System maintenance activities or updates may temporarily lock instances.
  
  Solutions:
  
  
  Identify the Lock:
  
  Use transaction SM12 to check for locks. You can see which user or process is holding the lock.
  Look for the instance number mentioned in the error message.
  
  
  
  Release the Lock:
  
  If you have the necessary authorizations, you can manually delete the lock entries in SM12. Be cautious when doing this, as it may affect other users or processes.
  If the lock is held by a background job, you may need to wait for the job to complete or terminate it if it is stuck.
  
  
  
  Check for Active Sessions:
  
  Use transaction SM04 to see active user sessions. If a user is logged in and holding the lock, you may need to contact them to log out or release the lock.
  
  
  
  Review Background Jobs:
  
  Use transaction SM37 to check the status of background jobs. If a job is holding the lock, you may need to wait for it to finish or cancel it if necessary.
  
  
  
  Database Locks:
  
  If the issue is related to database locks, you may need to consult with your database administrator to resolve the issue.
  
  
  
  System Restart:
  
  In some cases, a system restart may be necessary to clear locks, but this should be done with caution and typically as a last resort.
  
  
  
  Related Information:
  
  Documentation: Check SAP Notes and documentation for specific guidance related to your version of SAP and the context in which the error occurs.
  Support: If the issue persists, consider reaching out to SAP support for assistance, especially if it affects critical business processes.
  Monitoring: Implement monitoring tools to track locks and performance issues in your SAP environment to prevent future occurrences.
  
  Always ensure that you have the necessary authorizations and that you understand the implications of releasing locks, as it may affect other users or processes in the system.