Its giving me an error when I try and log in on my PS Vita! But when I create an account its fine!!!!!!!!!
So .... you use a new account, and then you have to have that new account on the PS3 if you are transferring a game from the PS3 to the PS Vita.
Or you can log in if it's a new account and you know how to login and then download it from PSN directly on the PS Vita.
But no old account purchase will work with a new account. All content must be "purchased" from PSN via the PS Vita user activated.