It's complicated to explain, but I found if you've registered your Vita to your PS3 which most people will do for remote play and other features, certain cross-play games won't let you play with your PS3 locally, because the way the games tend to use a lobby, in which you must join via Friends request, which you can't do because you can't friend yourself and your VITA shares the same account as the PS3.
Dragons Crown is a prime example. Had i not registered my Vita to my PS3 I could have 2 people on the PS3 and the VITA player could join the game by entering the lobby from friends request. Since it's classed as the same account, I can't use it to join my own network games.
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