This would be very useful for many use cases. Stop other users messing up key account SOP orders. Protect SOP documents where your GP company is made up of multiple "branch offices" that should be only responsible for their own orders and not "steal" allocated stock from orders made by other branches etc
I would add that this should roll up to the debtor(customer) or vendor too so it optionally roll down to orders created for that customer or vendor. That would make it really useful.