How To Fix MDG_MDF100 - Field &1 already exists under a different domain

SAP Error Message - Details

• Message type: E = Error

• Message class: MDG_MDF - Master Data: Messages

• Message number: 100

• Message text: Field &1 already exists under a different domain

What causes this issue?

Field &v1& is to be created with data element &v2&. However, this field
already exists and has data element &v3&.

System Response

The system will continue to use the existing data element &v3&; the
change will not be carried out.

How to fix this error?

Check the definition of field &v1& in all applications and areas, and
if necessary, adjust the definitions so they become consistent.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MDG_MDF100 - Field &1 already exists under a different domain ?

  The SAP error message MDG_MDF100 indicates that there is a conflict with a field that is being defined in the Master Data Governance (MDG) system. Specifically, it means that the field you are trying to create or modify already exists in the system but is associated with a different domain. This can occur when you are trying to create a new field or modify an existing one in the MDG data model.
  Cause:
  
  Field Name Conflict: The field name you are trying to use is already in use in another context or domain within the MDG framework.
  Domain Misconfiguration: The field might be defined in a different domain or entity, leading to a naming conflict.
  Data Model Changes: If there have been recent changes to the data model, it may have introduced conflicts with existing fields.
  
  Solution:
  
  
  Check Existing Fields: Review the existing fields in the MDG data model to see if the field name you are trying to use is already defined. You can do this by navigating to the relevant data model in the MDG configuration.
  
  
  Rename the Field: If the field name is already in use, consider renaming the new field to something unique that does not conflict with existing fields.
  
  
  Review Domain Assignments: Ensure that the field is being assigned to the correct domain. If it is mistakenly assigned to a different domain, correct the assignment.
  
  
  Consult Documentation: Refer to the SAP MDG documentation for guidelines on naming conventions and domain assignments to avoid conflicts.
  
  
  Transport Requests: If the issue arose after a transport, ensure that the transport did not inadvertently overwrite or conflict with existing configurations.
  
  
  Testing: After making changes, test the data model to ensure that the error is resolved and that the new field behaves as expected.
  
  
  Related Information:
  
  MDG Data Model: Understanding the structure of the MDG data model and how fields are organized within domains is crucial for troubleshooting this error.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on field naming and domain management.
  Community Forums: Engage with SAP community forums or support channels where similar issues may have been discussed, providing insights or solutions from other users.
  
  By following these steps, you should be able to resolve the MDG_MDF100 error and successfully manage your fields within the SAP MDG system.