Status of change request &1 does not permit changes

What causes this issue?

The status of change request &V1& does not permit changes to the object
or the object list.

System Response

You cannot make changes in change request &V1&.

How to fix this error?

The change request type is in a workflow step that does not permit
changes. Change the status of the change request to a status that
permits changes. This change depends on the workflow.

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.