How To Fix USMD1535 - Data model &1, entity type &2: Invalid use in hierarchy

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 535

• Message text: Data model &1, entity type &2: Invalid use in hierarchy

What causes this issue?

The hierarchy for entity type &V2& has an additional entity type &V3&
that uses the setting &V4& and the key assignment <LS>Key cannot be
changed, no internal key assignment.</> However, all entity types used
in a hierarchy (except for the entity type on which the hierarchy is
defined), must have the key assignment <LS>Key cannot be changed, no
internal key assignment.</>

System Response

The system cannot activate the data model &V1&

How to fix this error?

Change the type of key assignment for the entity type &V3&

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.