How To Fix ACO401 - Substitutes for '&1' have already been changed by another user

ACO401 - Overview

• Message type: E = Error

• Message class: ACO - Error Messages for Package ACO

• Message number: 401

• Message text: Substitutes for '&1' have already been changed by another user

What causes this issue?

You entered or deleted substitutes for '&V1&' and want to save the
changes. However, these substitutes have meanwhile been changed and then
saved by one or more other users.

System Response

The system does not allow you to save the changed substitutes for '&V1&'
and discards the changes you made because they are based on data that is
no longer up-to-date. Moreover, the updated substitutes for '&V1&' are
being loaded.

How to fix this error?

Check the updated substitutes for '&V1&' and change them if this is
still necessary.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ACO401 - Substitutes for '&1' have already been changed by another user ?

  The SAP error message ACO401 indicates that there is a conflict when trying to change substitutes for a specific object (denoted by '&1') because another user has already made changes to those substitutes. This typically occurs in scenarios where multiple users are trying to edit the same data simultaneously, leading to a lock situation.
  
  Cause:
  
  Concurrent Access: Another user has already modified the substitutes for the specified object, and the system has locked that data to prevent inconsistencies.
  Session Conflicts: If a user has multiple sessions open and is trying to change the same data in different sessions, it can lead to this error.
  Data Locking Mechanism: SAP uses a locking mechanism to ensure data integrity. When one user is editing data, it locks that data for other users until the first user saves or cancels their changes.
  
  
  Solution:
  
  Refresh the Data: If you encounter this error, try refreshing the screen or reloading the data. This