How To Fix UD804 - Reference Model not assigned to an object type in the Object Repository

SAP Error Message - Details

• Message type: E = Error

• Message class: UD - EDM - Enterprise Data Model

• Message number: 804

• Message text: Reference Model not assigned to an object type in the Object Repository

What causes this issue?

You would like to switch from a data model to the object type assigned
to it. This, however, is not possible since no object type has been
assigned to the referenced data model.

System Response

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

How to fix this error?

Please check to see whether you are in the desired data model.
Go to maintenance of the referenced model.
If required, assign to this data model an object type. To do this,
switch to the change modus and then switch again to the object type.
You then arrive in the Business Object Repository and can there create
the object. The object is created under the data model name and the
short text of the data model is adopted automatically.
On the other hand, you can terminate the Data Modeler and start the
Business Object Repository. Switch to the change modus of the object
types. There select the suitable object type. Then move to Basic data
and record in field Data model the name of the current referenced
model.

Error message extract from SAP system. Copyright SAP SE.