How To Fix UD603 - Entity type already exists; insert it in a data model

SAP Error Message - Details

• Message type: E = Error

• Message class: UD - EDM - Enterprise Data Model

• Message number: 603

• Message text: Entity type already exists; insert it in a data model

What causes this issue?

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

System Response

How to fix this error?

When you insert an entity type, only the following options are
provided:
1. Create a new entity type (with or without assignment to a data
model)
2. Assign an existing entity type to a data model
The entity type that was entered already exists, but was not placed on
a data model (colored-in area) when it was created graphically.
The insertion process is, therefore, canceled.

Error message extract from SAP system. Copyright SAP SE.