Make sure that topic's creator is playing an EUR console.It works? I thought I read on here somewhere that it was confirmed to not work? I think someone tested with an Ace Attorney game or something. I'll have to find the post/thread.
This answer looks weird. Since I tested using a JPN console to run the Ace Attorney 5 EUR and enter the DLC shop, it just automatically quitted from the shop once it had connected.For me it worked fine no problem.
I did DL the EUR rom and then purchased the DLC.