I've been fighting with Teutonic Order as Poland for few years. I demanded two provinces from its ally Bohemia and made a white peace with Gungary and Livonians. Now there is only one enemy, supreme beaten by me (100%). And the problem is that I cannot cede any provinces (subjudgatio CS) neither vassalize them (to high cost of all provices). I'm sure it's kind of a bug or something like that. Is there a way to resolve my problem? Latest patch of course. No mods.