How To Fix USMD1621 - Data model &1, entity type &2: Reference attribute &3 is a key field

USMD1621 - Overview

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 621

• Message text: Data model &1, entity type &2: Reference attribute &3 is a key field

What causes this issue?

A referencing relationship with the name &V3& was assigned to entity
type &V2& in model &V1&. However, the entity type already has a key
field with the same name. Within an entity type, no referencing
relationship can have the same name as a key field.

System Response

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

The model cannot be activated.
ELSE
The model cannot be saved.
ENDIF

How to fix this error?

Enter a different name for the referencing relationship.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

USMD1621 - Details

• The SAP error message USMD1621 typically occurs in the context of SAP Master Data Governance (MDG) when there is an issue with the data model configuration, specifically related to reference attributes and key fields in an entity type.
  
  Cause:
  The error message indicates that a reference attribute in the specified entity type is being treated as a key field. In SAP MDG, reference attributes are used to link to other entities, but they should not be defined as key fields. Key fields are unique identifiers for records in a database table, while reference attributes are meant to establish relationships between different entities.
  
  Solution:
  To resolve this error, you should check the configuration of the data model and the entity type mentioned in the error message. Here are the steps you can take:
  
  
  Access the Data Model Configuration:
  
  Go to the SAP MDG configuration transaction (usually MDGIMG or SPRO).
  Navigate to the section where you can manage data