How To Fix USMD1590 - Data model &1, foreign key relationship &2: Field assignment missing

USMD1590 - Overview

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 590

• Message text: Data model &1, foreign key relationship &2: Field assignment missing

What causes this issue?

You have specified the attribute &V2& as a key field. You still need to
assign the attribute in a foreign key relationship.

System Response

The data model cannot be saved or activated.

How to fix this error?

Edit the fields in the <LS>Fields of Foreign Key Relationships</> view
in Customizing activity <DS:SIMG.FMDM_USMD001>Edit Data Model</>.

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.

USMD1590 - Details

• The SAP error message USMD1590 indicates that there is a missing field assignment in a foreign key relationship within a data model. This typically occurs in the context of SAP Master Data Governance (MDG) when you are trying to create or modify a data model, and it is unable to find the necessary field assignments for the specified foreign key relationship.
  
  Cause:
  
  Missing Field Assignment: The error usually arises when a field that is supposed to be linked through a foreign key relationship is not properly assigned in the data model.
  Incorrect Configuration: There may be an issue with the configuration of the data model, such as missing or incorrect definitions of the foreign key relationships.
  Data Model Changes: If changes were made to the data model (like adding or removing fields) without properly updating the foreign key relationships, this error can occur.
  Inconsistent Data: If the data being processed does not conform to the