A friend of mine bought the Vietnam expansion in the Playstation Store and tried to share with me. I downloaded the expansion with the account he provided, but it didn't work, the option to play Vietnam didn't show on my game's menu. My Bad Company 2 copy is from Hong Kong, and he said it might be because the account he used to buy his Vietnam expansion was from the UK. If I buy the expansion myself with my US account, will it work for my copy of the game? Is there a way to know beforehand if it will work?