How To Fix USMD1551 - Model &1, entity type &2: Attribute &3 must not be a key field

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 551

• Message text: Model &1, entity type &2: Attribute &3 must not be a key field

What causes this issue?

You have tried to make the &V3& attribute an additional key field of the
&V2& entity type. The system does not allow you to do this because the
&V2& entity type is configured as being relevant for hierarchies.

System Response

You are not allowed to save your changes.

How to fix this error?

Deselect the <LS>Key Field</> indicator for the &V3& attribute of the
&V2& entity type.

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.