I just saved Goniff Basitid's caravan. The "Who can use this" option after selecting the item doesn't function properly. Instead, I get locked out of every option except, "I'll take this".
I'm playing the GOG version, if that makes a difference.
Hey! I literally just pushed an update that fixes this bug. In the meantime, try clicking "No thanks" multiple times to back out of a purchase. ;)