How To Fix DMU021 - Active alternative segment & cannot be deleted

SAP Error Message - Details

• Message type: E = Error

• Message class: DMU - Digital Mock Up (DMU)

• Message number: 021

• Message text: Active alternative segment & cannot be deleted

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message DMU021 - Active alternative segment & cannot be deleted ?

  The SAP error message DMU021 ("Active alternative segment & cannot be deleted") typically occurs in the context of the SAP Data Migration Workbench or when dealing with alternative segments in the SAP system. This error indicates that you are trying to delete an alternative segment that is currently active, which is not allowed.
  Cause:
  
  Active Alternative Segment: The segment you are trying to delete is currently active in the system. This means that it is being used in some capacity, and SAP does not allow the deletion of active segments to maintain data integrity.
  Dependencies: There may be dependencies or references to the segment in other parts of the system, which prevents its deletion.
  
  Solution:
  
  
  Deactivate the Segment: Before attempting to delete the segment, you need to deactivate it. This can usually be done through the relevant transaction or configuration settings in SAP.
  
  Navigate to the relevant transaction (e.g., transaction code for managing segments).
  Find the segment you want to delete and change its status to inactive.
  
  
  
  Check for Dependencies: Ensure that there are no other objects or processes that depend on the segment. You may need to review related configurations or data models to identify any dependencies.
  
  
  Delete the Segment: Once the segment is inactive and you have confirmed that there are no dependencies, you can proceed to delete the segment.
  
  
  Consult Documentation: If you are unsure about the steps or the implications of deactivating and deleting segments, refer to the SAP documentation or consult with your SAP administrator or support team.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes that deal with segments, such as SE11 (Data Dictionary), SE80 (Object Navigator), or specific transaction codes related to your module.
  SAP Notes: Check SAP Notes for any specific guidance or updates related to this error message. SAP Notes can provide insights into known issues and recommended solutions.
  Testing: After making changes, ensure to test the system to confirm that the deletion did not affect any other functionalities.
  
  If you continue to experience issues or if the segment is critical to your operations, it may be advisable to seek assistance from SAP support or a qualified SAP consultant.