functionId &1: Object type &2 not defined

What causes this issue?

The ranking function refers a definition in Enterprise Search, where the
ranking function specifies a refinement by object type (in CDS separated
by '.' from the id in the strict sense). The possible object types are
also defined in Enterprise Search. Object type &V2& is not possible for
ranking function &V1&.

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?

Correct the definition, by choosing a valid object type. If a new object
type is to be introduced, do this a first step in Enterprise Search,
before using it here.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.