How To Fix AD021 - & & is locked by another transaction

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 021

• Message text: & & is locked by another transaction

What causes this issue?

The object you want to edit is already being edited by another user.

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 again later or use transaction SM12 to check whether you locked
the object yourself (earlier program abort when editing the same
object).
If you locked the object, you can use SM12 to remove the lock.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD021 - & & is locked by another transaction ?

  The SAP error message AD021 indicates that a particular object (such as a table, program, or transaction) is locked by another transaction. This typically occurs when multiple users or processes are trying to access or modify the same object simultaneously, leading to a conflict.
  Cause:
  
  Concurrent Access: Another user or process is currently using the object, which prevents your transaction from accessing it.
  Long-Running Transactions: A transaction that takes a long time to complete can hold locks longer than expected, causing other transactions to wait.
  Deadlocks: In some cases, two transactions may be waiting for each other to release locks, leading to a deadlock situation.
  System Configuration: Certain configurations or settings in the SAP system may lead to more frequent locking issues.
  
  Solution:
  
  Wait and Retry: Often, simply waiting for a few moments and then retrying the transaction can resolve the issue, as the lock may be released once the other transaction completes.
  Identify the Lock: Use transaction code SM12 to view the list of locks in the system. You can identify which user or transaction is holding the lock.
  Release the Lock: If you have the necessary authorizations, you can manually release the lock from transaction SM12. However, be cautious when doing this, as it may disrupt the other user's work.
  Check for Long-Running Transactions: Use transaction SM66 to monitor active processes and identify any long-running transactions that may be causing locks.
  Optimize Transactions: If certain transactions frequently cause locking issues, consider optimizing them to reduce their execution time.
  Consult with Basis Team: If the issue persists, it may be necessary to involve your SAP Basis team to investigate further, as they can analyze system performance and locking behavior.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: Display and manage locks.
  SM66: Global work process overview.
  SM21: System log for error messages and warnings.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to locking behavior in your specific version of SAP.
  Documentation: Review SAP documentation for best practices on transaction management and locking mechanisms.
  
  By following these steps, you should be able to address the AD021 error and minimize its occurrence in the future.