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

SAP Error Message - Details

• 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 to make changes until it is either reverted or a new change number is created.
  
  
  Use a Different Change Number: If you need to make changes, consider using a different change number that is not locked or associated with the object you are trying to modify.
  
  
  Unlock the Change Number: If you have the necessary permissions, you may be able to unlock the change number or change its status to allow modifications. This typically requires administrative access.
  
  
  Consult Documentation: Review the relevant SAP documentation or guidelines for change management to understand the proper procedures for handling change numbers.
  
  
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with an SAP expert who can provide guidance based on your specific configuration and business processes.
  
  
  Related Information:
  
  Change Management in SAP: Understanding how change numbers work in SAP is crucial. Change numbers are used to track changes to materials, BOMs (Bill of Materials), routings, and other objects.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CC01 (Create Change Number), CC02 (Change Change Number), and CC03 (Display Change Number) to manage change numbers effectively.
  Authorization Issues: Sometimes, the error may also be related to authorization issues. Ensure that you have the necessary permissions to make changes to the object in question.
  
  By following these steps, you should be able to address the C1891 error and proceed with your changes in SAP.