How To Fix EG121 - You cannot change the group mat. no; it is still a ref. group mat. no

SAP Error Message - Details

• Message type: E = Error

• Message class: EG - IS-U device management

• Message number: 121

• Message text: You cannot change the group mat. no; it is still a ref. group mat. no

What causes this issue?

The current device category is still a main serialization material
within a group of device categories. Therefore, you cannot change the
current group material.

System Response

Processing cannot be continued.

How to fix this error?

Enter the number of the current device category as the group material
number.
If you want to break up or change the serialization group of the
current device category, remove the reference to the current device
category from all dependent device categories of the serialization
group.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message EG121 - You cannot change the group mat. no; it is still a ref. group mat. no ?

  The SAP error message EG121 indicates that you are trying to change a group material number that is still being referenced as a reference group material number. This typically occurs in the context of material master data management, particularly when dealing with material groups and their relationships.
  Cause:
  The error arises when you attempt to modify a group material number that is currently linked to a reference group material number. In SAP, a reference group material number is used to maintain consistency and integrity in material data. If the group material number is still being referenced, the system prevents changes to avoid data inconsistencies.
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check References: Identify where the group material number is being referenced. You can do this by checking the material master records or any related documents that might be using this group material number.
  
  
  Remove References: If possible, remove or change the references to the group material number. This may involve updating related material master records or other dependent objects.
  
  
  Change Group Material Number: Once all references have been cleared, you should be able to change the group material number without encountering the error.
  
  
  Consult Documentation: If you are unsure about the implications of changing the group material number, consult your organization's documentation or SAP help resources to understand the impact on your material management processes.
  
  
  Authorization: Ensure that you have the necessary authorizations to make changes to material master data. Sometimes, restrictions may be in place that prevent changes.
  
  
  Contact Support: If you are unable to resolve the issue on your own, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  
  Related Information:
  
  Material Master Data: Understanding how material master data is structured in SAP can help you navigate issues related to group material numbers and references.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional guidance.
  Transaction Codes: Familiarize yourself with transaction codes related to material master maintenance, such as MM01 (Create Material), MM02 (Change Material), and MM03 (Display Material).
  
  By following these steps, you should be able to resolve the EG121 error and successfully change the group material number as needed.