Status & is a primary status

What causes this issue?

You want to set the status of a document to &V1&.
For this document type, this status is defined as a primary status.
This means that the document is assigned this status automatically when
it is created, and cannot be reset to this status at a later date.

How to fix this error?

Display the possible entries for status.
Select one of the possible statuses.
If you still want to reset the document to status &V1&, contact your
system manager.
Check whether the status network needs to be changed for the document
type. If you define status &V1& as having status type "initial status",
you can set this status again at a later date.

Error message extract from SAP system. Copyright SAP SE.