How To Fix USMD1040 - Data model &1, entity type &2: Leading entity type &3 is invalid

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 040

• Message text: Data model &1, entity type &2: Leading entity type &3 is invalid

What causes this issue?

Relationships with <LS>Leading</> or <LS>Qualifying</> as the
relationship type are not allowed between entity types with the
<DS:DE.USMD_USAGE_TYPE>storage and use type</> <LS>1</> or <LS>2</> and
entity types with the storage and use type <LS>3</>.

System Response

The data model cannot be saved or activated.

How to fix this error?

Delete the invalid relationship.

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.