Filip Peric :
Thank you. So i will be able to play games online and purchase them in the store from Serbia? And DLC's bought from Austria should work if the game is region-locked to Austria, because my account is set to Austria?
Store automatically updates to the country you are logging in from. Doesn't matter what you set your account to as per my knowledge. And yes, as long as both games and it's dlc(s) belong to same region they will work.