functionId &1: Object type cannot be specified

What causes this issue?

When referring a ranking function defined in Enterprise Search, '.' is
interpreted as a separator between the id in the strict sense and its
refining object type. According to this, &V1& contains an object type
specification; but the Enterprise Search ranking function definition
does not allow such refinement for this ranking function.

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?

Remove the object type definition.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.