Shop Purchase Item

Is it possible to use triggers so that when I create a shop (which has it's own invintory) I can cause the "Shop Purchase Item" ability to target the shop so that I can sell items from the shop to the shop (I know that sounds weird). I already tried editing the "Shop Purchase Item" ability to only target "self" but it didn't work.

Purchase items only works for heros.

If you want to trade items between shops you have to use the code
Neutral Building-remove item for sale(or something like that)
and then
Neutral Building-Add item for sale

the items in shops are not stored in inventories, they don't exist until they get bought.

You are incorrect, the way I have it set up currently is that you have to manually select the shop as the unit you are selling too, it works, but I want to make it so that the shop is selected by "default."

EDIT: I am actually wrong about the ability name, the ability name is "shop sharing," not "shop purchase item." But the problem remains the same.

Change the range of the ability to 100 or 50. Then the only unit in range will be the shop.