Hm, I was thinking about replacing the Disk version of Tekken Tag Tournament 2 with the digital version, but my external drive wasn't recognized in the eShop. It only showed that the space of the internal memory wasn't enough.
I clicked on other games and they recognized the external USB drive properly.
EDIT: I had to move the save data to the external drive, it works now. I should have known that...
Btw: the title of the thread only shows "UPDATE:NA2", probably because of the <>... And it's only "..." in the buddy.
EDIT: the thread title works now.