This document type assignment allocates task &1 to a different monitor

What causes this issue?

You assigned <DS:GLOS.document_type>document types</> to
<DS:GLOS.task>task</> &V1&. Previously, other document types were
assigned and valid up to now.
This change of document types would force you to change the task's
relationship to the data monitor or the consolidation monitor.
Unfortunately, this is no longer possible because task &v1& already has
a status.

System Response

This setting cannot be saved.

How to fix this error?

Chronologically, only assign document types that correspond with the
old assignments, as explained above.

Error message extract from SAP system. Copyright SAP SE.