Resource &1 already exists

What causes this issue?

You are attempting to create the resource &V1& in plan version &V2&.
There is already a resource with this object ID.

How to fix this error?

Please choose another object ID for your new object or delete all data
from the field. When you do so, the system will automatically create an
object ID for the new object.

Error message extract from SAP system. Copyright SAP SE.