How To Fix USMD1538 - Data model &, entity type &2: Invalid use of keys in hierarchy

USMD1538 - Overview

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 538

• Message text: Data model &, entity type &2: Invalid use of keys in hierarchy

What causes this issue?

The key fields of the entity types in a hierarchy have to be part of the
key fields of the entity type &V3&. If it is a non-synchronized
hierarchy the hierarchy name can be used as key field as well.

System Response

The system cannot activate data model &V1&.

How to fix this error?

Change the key of &V3&, change the key of &V2&, or delete &V2& from the
list of hierarchy nodes.

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.

USMD1538 - Details

• The SAP error message USMD1538 typically occurs in the context of SAP Master Data Governance (MDG) when there is an issue with the hierarchy structure of a data model. This error indicates that there is an invalid use of keys in a hierarchy for a specific entity type. Here’s a breakdown of the cause, potential solutions, and related information:
  
  Cause:
  
  
  Invalid Key Configuration: The error often arises when the keys defined for a hierarchy node do not conform to the expected structure or rules defined in the data model. This can happen if:
  
  The key fields are not properly defined in the hierarchy.
  There are inconsistencies in the hierarchy levels.
  The hierarchy is trying to reference keys that do not exist or are not valid for the entity type.
  
  
  
  Data Integrity Issues: If the data being processed has integrity issues, such as missing or incorrect key values, it can lead to this error.
  
  
  Model Configuration Errors: There