Well you can check who has it in the selection... would be buggy though. You could make it so if some1 else is selecting it then u click it deselects it from u then that would work right
I just wanted to tell everyone I finally figured out a way to do it.
I gave my unit the Sell Items ability and a item to sell and then detected who bought the item. I could probably of done it with Mercenary hire as well.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.