How To Fix WW021 - You maintained the material group without assigning a reference material

WW021 - Overview

• Message type: E = Error

• Message class: WW - Material group master maintenance

• Message number: 021

• Message text: You maintained the material group without assigning a reference material

What causes this issue?

You canceled maintenance of the reference material. As a result, no
reference material has been defined for the material group.

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?

Maintain the reference material later on in change mode.

Error message extract from SAP system. Copyright SAP SE.

WW021 - Details

• The SAP error message WW021 indicates that a material group has been maintained without assigning a reference material. This typically occurs in the context of material master data management, particularly when creating or modifying material groups in the SAP system.
  
  Cause:
  The error arises when:
  
  A material group is created or modified, but no reference material is assigned to it.
  The system requires a reference material to derive certain attributes or characteristics for the materials that will be assigned to this group.
  
  
  Solution:
  To resolve the WW021 error, you can follow these steps:
  
  
  Assign a Reference Material:
  
  Go to the transaction code MM01 (Create Material) or MM02 (Change Material).
  Navigate to the relevant material group.
  Assign a reference material that has the necessary attributes and characteristics.
  
  
  
  Check Material Group Settings:
  
  Use transaction code OMD1 to check the settings for the material group.
  Ensure that the material group is correctly configured and that a reference material is assigned.
  
  
  
  Create a Reference Material:
  
  If no suitable reference