How To Fix USMD1551 - Model &1, entity type &2: Attribute &3 must not be a key field

USMD1551 - Overview

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 551

• Message text: Model &1, entity type &2: Attribute &3 must not be a key field

What causes this issue?

You have tried to make the &V3& attribute an additional key field of the
&V2& entity type. The system does not allow you to do this because the
&V2& entity type is configured as being relevant for hierarchies.

System Response

You are not allowed to save your changes.

How to fix this error?

Deselect the <LS>Key Field</> indicator for the &V3& attribute of the
&V2& entity type.

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.

USMD1551 - Details

• The SAP error message USMD1551 indicates that there is an issue with the data model configuration in the SAP Master Data Governance (MDG) system. Specifically, it states that an attribute (field) that you are trying to define as a key field in a model is not allowed to be a key field for the specified entity type.
  
  Cause:
  
  Incorrect Configuration: The attribute you are trying to set as a key field is not defined as a key field in the underlying data model for that entity type. Key fields are typically used to uniquely identify records in a database table, and not all attributes can serve this purpose.
  Data Model Restrictions: The data model may have specific restrictions on which attributes can be designated as key fields. This is often defined in the data model configuration and can vary based on the entity type.
  
  
  Solution:
  
  Review Data Model Configuration: Check the data model configuration for