How To Fix EM428 - Activity group &1 is used in activity group &2

SAP Error Message - Details

• Message type: E = Error

• Message class: EM - IS-U Migration

• Message number: 428

• Message text: Activity group &1 is used in activity group &2

What causes this issue?

You tried to delete activity group &V1&, but it is still being used in
activity group &V2&.

System Response

INCLUDE ISU_VERARB DOKU ID TX

How to fix this error?

Change activity group &V2&.

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 EM428 - Activity group &1 is used in activity group &2 ?

  The SAP error message EM428 indicates that there is a conflict with activity groups in your SAP system. Specifically, it means that the activity group you are trying to use is already being utilized in another activity group. This can occur in various contexts, such as when managing project systems, controlling, or other modules where activity groups are defined.
  Cause:
  The error typically arises due to one of the following reasons:
  
  Duplicate Usage: The same activity group is being referenced in multiple places, which is not allowed.
  Configuration Issues: There may be a misconfiguration in the way activity groups are set up in the system.
  Data Integrity: There could be issues with data integrity, where the system is not able to correctly identify the relationships between activity groups.
  
  Solution:
  To resolve the EM428 error, you can take the following steps:
  
  
  Identify the Activity Groups: Check the activity groups mentioned in the error message. You will need to identify where each activity group is being used.
  
  
  Review Activity Group Assignments: Go to the relevant transaction (like CJ20N for project management) and review the assignments of the activity groups. Ensure that the same activity group is not assigned to multiple parent groups or projects.
  
  
  Modify Assignments: If you find that an activity group is being used inappropriately, you may need to modify the assignments. This could involve removing the activity group from one of the locations or reassigning it to a different group.
  
  
  Check for Locks: Sometimes, the error can be caused by locks in the system. Ensure that no other users are currently editing the same activity groups.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on managing activity groups in your version of SAP.
  
  
  Contact SAP Support: If the issue persists and you cannot find a resolution, consider reaching out to SAP support for assistance. They can provide more detailed insights based on your specific system configuration.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CJ20N (Project Builder), CJ02 (Change Project), or others related to your specific module.
  SAP Notes: Check SAP Notes for any known issues or patches related to activity groups and the EM428 error.
  User Roles: Ensure that you have the appropriate permissions to modify activity groups, as restrictions can also lead to errors.
  
  By following these steps, you should be able to diagnose and resolve the EM428 error in your SAP system.