How To Fix C1891 - You cannot change "&" with change number "&"

C1891 - Overview

• Message type: E = Error

• Message class: C1 - Characteristics maintenance messages

• Message number: 891

• Message text: You cannot change "&" with change number "&"

What causes this issue?

The object has been classified in more than one class. On the date
on which you want to make the change, a change was made to another
classification of the object using a different change number. However,
you can only use one change number to change classification data for an
object on one date.

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?

Enter the change number you used to change the other classification on
this date.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message C1891 - You cannot change "&" with change number "&" ?

  The SAP error message C1891, which states "You cannot change '&' with change number '&'," typically occurs in the context of change management within SAP, particularly when dealing with change numbers in the context of configuration management or engineering change management (ECM).
  
  Cause:
  This error usually arises when you attempt to make changes to a document, material, or object that is already associated with a specific change number. The system prevents changes to ensure data integrity and to maintain a clear audit trail of changes made to objects under a specific change number. The error indicates that the object you are trying to modify is locked for changes under the specified change number.
  
  Solution:
  To resolve this error, you can consider the following steps:
  
  
  Check Change Number Status: Verify the status of the change number you are trying to use. If it is already in use or has been released, you may not be able