Quote Originally Posted by Zari View Post
Maybe not even in the currency tab. Just put them in key items instead. There is plenty of room in there that is NEVER used
If you pick up a dozen beast tribe quests that have between one and three key items each (as the Ixal ones do, for instance), plus have a hunt bill or two or maybe a miscellaneous item from whichever MSQ you're in the middle of, then you most certainly can fill the key items tab.

(I've never actually seen what happens when you run out of room there, since I more typically do 6 of those quests at a time, and then the other 6, and there's room enough that way. Maybe next time I'll try doing all 12 together and see what happens. My guess is that you can't advance the quest, just like if it needed to put something in regular inventory when your inventory was full.)