How To Fix EG120 - Device category &1 already has group material number &3

SAP Error Message - Details

• Message type: E = Error

• Message class: EG - IS-U device management

• Message number: 120

• Message text: Device category &1 already has group material number &3

What causes this issue?

Serialization material &V1& for device category &V2& already has
serialization number (group material number) &V3&.

System Response

Processing cannot be continued.

How to fix this error?

Ensure that your entry is correct. If you wish to allocate device
category &V2& to the same serialization group as device category &V1&,
enter serialization material &V3&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message EG120 - Device category &1 already has group material number &3 ?

  The SAP error message EG120 indicates that there is an issue with the assignment of a group material number to a device category. Specifically, it means that the device category you are trying to assign already has a group material number associated with it.
  Cause:
  
  Duplicate Assignment: The device category you are trying to use is already linked to a different group material number.
  Configuration Error: There may be a misconfiguration in the device category settings or in the group material number assignments.
  Data Integrity Issues: There could be inconsistencies in the master data that lead to this error.
  
  Solution:
  
  
  Check Existing Assignments:
  
  Go to the relevant transaction in SAP (e.g., transaction code OIS2 or similar) to check the current assignments of device categories and group material numbers.
  Identify if the device category is already assigned to a different group material number.
  
  
  
  Modify or Remove Existing Assignment:
  
  If the device category is already assigned to a group material number that you do not need, you can either modify or remove that assignment.
  Ensure that the new assignment you are trying to make does not conflict with existing ones.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation or configuration guides related to device categories and group material numbers to ensure you are following the correct procedures.
  
  
  
  Data Consistency Check:
  
  Perform a data consistency check to ensure that there are no other underlying issues with the master data that could be causing this error.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP support for assistance. They can provide more detailed insights based on your specific configuration and data.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as OIS2 (for device categories) and OIS3 (for group material numbers).
  Master Data Management: Understanding how master data is managed in SAP can help prevent similar issues in the future.
  User Authorization: Ensure that you have the necessary authorizations to make changes to device categories and group material numbers.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.