Receiver field &1 (char &2) is not a custom subassignment

What causes this issue?

In field movement for realtime updates, only custom subassignments can
be used as receiver fields. Receiver field &V1& (characteristic &V2&)
is a SAP Consolidation standard subassignment.

System Response

The field movement contains errors and can not be saved.

How to fix this error?

Select a custom subassignment for the receiver field.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.