Hi Basir,
I have understood your query properly but still I want to know what are those changes on network activity for which you want the restriction.
May be validations or any particular business transaction in user status would be able to help you. But since you have said that you were trying to achieve it by Partially Confirmed Activity in OPSG, so I rather believe that you need to keep restriction on status of network activity. Isn't it.?
If yes, then try to use Business Transaction as Release Operation or Partially Confirm Operation and mark it as forbidden. Just check and revert back. Though it is just a wild guess.
Else,
You may go with expert advise by providing authorization with the help of Basis person.
Regards,
Amit