Your DLC code for White/Black Knight does not work because you have to get it from the US PSN. Either you make a fake US PSN account just for downloading it or get it via the US PSN website (which is not recommended). You need a US address, fake one to make the account.
You probably have the R1 version by the way, not R3. R1 is USA, R3 is Asia.That is why the code is not working.
hahaha It's funny because my disc cover even has a for SE ASIA only sticker on it along with the R3 logo on it. I guess they just put the wrong cards in
