How To Fix SO809 - Substitute list of <&> already being processed

SAP Error Message - Details

• Message type: E = Error

• Message class: SO - SAPoffice: message texts

• Message number: 809

• Message text: Substitute list of <&> already being processed

What causes this issue?

The substitute list of & is already being processed by another user and
is therefore locked.

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 SO809 - Substitute list of <&> already being processed ?

  The SAP error message SO809, which states "Substitute list of <&> already being processed," typically occurs when there is an attempt to process a substitute list that is already being handled in the system. This can happen in various scenarios, such as when multiple users or processes are trying to access or modify the same substitute list simultaneously.
  
  Cause:
  
  Concurrent Processing: The most common cause is that the substitute list is already being processed by another user or transaction. SAP does not allow multiple processes to modify the same data simultaneously to maintain data integrity.
  Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. If a user is editing or processing a substitute list, it will lock that list for other users until the process is completed.
  Long-running Transactions: If a transaction takes too long to complete, it may lead to other users encountering this error while trying to access the same