I read the document and I have one additional question.
What can be considered for applied rule?
Is it a rule that was chosen according conditions but wasn't performed yet or is it a rule that was chosen according conditions and was already performed?
When I was checking some setting under document types I found attribute "Approver can modify".
Is an approver mentioned also like a notification owner? When approver has been sharing his worklist then grantee doesn't get ownership of his notifications.
Can we presume that notification owner is same person as an approver?
I suppose that answer is yes and that user must become an owner of the notification to be able update a PR form.