How To Fix GRPG012 - Change not possible, because assignments are not unique

GRPG012 - Overview

• Message type: E = Error

• Message class: GRPG - Grouping/Pegging for Individual Project Planning

• Message number: 012

• Message text: Change not possible, because assignments are not unique

What causes this issue?

You have already assigned WBS elements to this grouping WBS element.
Since you have have assigned WBS element &v1& to several different
grouping WBS elements, it is not possible to change the MRP indicator.

System Response

INCLUDE NA_ALLG_NOVERARBEITUNG OBJECT DOKU ID TX

How to fix this error?

Undo the changes to the MRP indicator or delete the assignment of WBS
element &v1& to this grouping WBS element.

Error message extract from SAP system. Copyright SAP SE.

GRPG012 - Details

• The SAP error message GRPG012 ("Change not possible, because assignments are not unique") typically occurs in the context of managing assignments in SAP, particularly when dealing with master data or configuration settings. This error indicates that the system has detected a situation where the assignment you are trying to change is not unique, meaning that there are multiple entries that could match the criteria you are trying to modify.
  
  Cause:
  
  
  Duplicate Entries: The most common cause of this error is that there are duplicate entries in the database for the object you are trying to change. For example, if you are trying to assign a cost center to a profit center and there are multiple cost centers assigned to the same profit center, the system cannot determine which one to change.
  
  
  Incorrect Configuration: Sometimes, the configuration settings in the system may not be set up correctly, leading to ambiguous assignments.
  
  
  Data Integrity Issues: There