How To Fix AQ521 - Table is already being used

AQ521 - Overview

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 521

• Message text: Table is already being used

What causes this issue?

The table you attempted to include in the join already exists. This is
not allowed.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AQ521 - Table is already being used ?

  The SAP error message AQ521, which states "Table is already being used," typically occurs when there is an attempt to perform an operation on a database table that is currently locked or in use by another process. This can happen in various scenarios, such as during data updates, table modifications, or when trying to access a table that is being processed by another transaction.
  Causes:
  
  Concurrent Access: Multiple users or processes are trying to access or modify the same table simultaneously.
  Long-Running Transactions: A transaction that takes a long time to complete may hold a lock on the table, preventing other operations from proceeding.
  Database Locks: The database may have locks in place due to previous operations that have not yet been committed or rolled back.
  Background Jobs: A background job or batch process may be running that is using the table.
  
  Solutions:
  
  Wait and Retry: If the operation is not urgent, wait for a few moments