Related perspective attribute &1 is already given fixed values

What causes this issue?

An attribute of a related perspective can only:
be assigned to a response field
be given a fixed value
Attribute &v1& is already given a fixed value and thus cannot be
assigned to a response field.

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 your entries accordingly.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.