Interesting and odd thing happened to me this month. I have been frequently able to purchase Disney GC and eBay GC at one specific BB store with BB PPDG. One night after a movie dinner date with my GF, I stopped by again to start cashing out Disney GC, but apparently it was later in the night and the floor cashier lead was there, and he flat out said I can't do that and the computers don't allow it. Didn't stir trouble, but felt pretty bad because he wasn't very respectable to me regarding it.
Kind of freaked out that weekend because we had so much in funds that's not in Disney GC yet. The following Sunday I decided to try online BB order to pick up in store for only Disney GC, and it worked when I paid with BB GC and also got Ebates. I gave me hope to continue with BB, but I tried again on Wednesday and it was cancelled. This is when it got weird because it went through perfectly fine on Sunday, and it didn't on Wednesday.
Same stores, different days. Curiosity got the best of me and I tried agian today (Sunday). And it worked again! It's ready for pick up.
I have a theory that it might be a department in BB that process store pick ups since when you come in, it's on the different register than checkouts. And maybe that the people scheduled to work on Sundays actually know where the Disney GCs are and processes it for me, while other people on different days either don't try hard enough or doesn't know where to process my order. Or maybe it's the same cashier lead that cancels the online orders when they see BB GC payments?
Either way, that guy was wrong. The system allows it, and some people in your store does it.