How To Fix USMD1042 - Data model &1, entity type &2: Number of leading entity types is invalid

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 042

• Message text: Data model &1, entity type &2: Number of leading entity types is invalid

What causes this issue?

For entity types with storage and use type <LS>3</> for which the check
table is predefined by the data element or domain, the other key fields
in the check table must be mapped using relationships with <LS>Leading
</> as the relationship type. The check table for entity type &V2&
contains &V3& additional key fields. However, &V4& leading entity types
are defined using relationships.

System Response

The data model cannot be saved or activated.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.