functionId &1: Object type must be specified

What causes this issue?

Ranking function &V1& is defined in Enterprise Search, and the
definition includes a refinement by an object type.

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?

Specify the object type, according to the definition in Enterprise
Search. The object type is appended to the function id, separated by a
dot; like 'ES:ZMY_RANK_FUNC.SalesOrder'.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.