How To Fix WW020 - Material group material & already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: WW - Material group master maintenance

• Message number: 020

• Message text: Material group material & already exists

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?

Please enter a new key term.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WW020 - Material group material & already exists ?

  The SAP error message WW020, which states "Material group material & already exists," typically occurs when you attempt to create or modify a material in SAP and the specified material group already has an existing entry in the system. This can happen in various scenarios, such as when creating a new material or trying to assign a material group to an existing material.
  Cause:
  
  Duplicate Entry: The material group you are trying to assign to the material already exists in the system for another material.
  Incorrect Material Group: You may be trying to use a material group that is not valid or has been incorrectly defined.
  Data Consistency Issues: There may be inconsistencies in the data that lead to the system recognizing the material group as already existing.
  
  Solution:
  
  
  Check Existing Material Groups: 
  
  Use transaction codes like MM03 (Display Material) or MM02 (Change Material) to check if the material group is already assigned to another material.
  You can also use transaction OMD1 to view material groups and their assignments.
  
  
  
  Change Material Group: 
  
  If the material group is indeed already assigned, consider using a different material group that is not in use.
  You can create a new material group if necessary, using transaction OMD2 (Create Material Group).
  
  
  
  Review Material Master Data: 
  
  Ensure that the material master data is correctly maintained and that there are no inconsistencies.
  Check for any custom validations or enhancements that might be causing this error.
  
  
  
  Consult with SAP Support: 
  
  If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting SAP Notes for any known issues related to this error.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM01 (Create Material), MM02 (Change Material), MM03 (Display Material), and OMD1 (Material Group).
  SAP Notes: Check SAP Notes for any updates or patches that might address this issue.
  User Authorizations: Ensure that you have the necessary authorizations to create or modify materials and material groups in the system.
  
  By following these steps, you should be able to identify the cause of the WW020 error and implement a suitable solution.