How To Fix USMD1557 - Data model &1: Key attributes must not be assigned to entity type &2

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 557

• Message text: Data model &1: Key attributes must not be assigned to entity type &2

What causes this issue?

The &V3& attribute is defined as key field. This is not allowed for
attributes of entity types of storage and usage type 4.

System Response

The system does not save or activate the data model.

How to fix this error?

In the <LS>Attributes </>view, deselect <LS>Key Field</> for the &V3&
attribute.
If you want to create a key field for the &V2& entity type, choose the
<LS>Relationships </>view.

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.