How To Fix WW002 - MG reference material and MG material cannot be same

WW002 - Overview

• Message type: E = Error

• Message class: WW - Material group master maintenance

• Message number: 002

• Message text: MG reference material and MG material cannot be same

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Change one of the material numbers.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WW002 - MG reference material and MG material cannot be same ?

  The SAP error message WW002, which states "MG reference material and MG material cannot be the same," typically occurs in the context of Material Management (MM) when you are trying to create or modify a material that is set up as a reference material (or a material group) and the system detects that the reference material and the material being created or modified are identical.
  
  Cause:
  
  Duplicate Material Assignment: The error arises when you attempt to assign a material as its own reference material. In SAP, a reference material is meant to serve as a template or standard for other materials, and it cannot reference itself.
  
  Configuration Issues: There may be issues in the configuration of material types or settings that allow for this incorrect assignment.
  Data Entry Error: It could also be a simple data entry mistake where the same material number is inadvertently entered in both fields.
  
  
  Solution:
  
  Check Material Assignment: Review the material