Split ATP Rules by Business Unit or any other means

Hello, we are having a situation where ATP Rules print "In Stock" for an item which is about to be added to a Sales Order. However, it is important for our user to be able to see "In Stock" only for items which are in the warehouse of the store our user is operating in. This is important because the user needs to know whether he will choose a demand class (which is connected to interorganization transfer) on the "Supply" tab or he will just leave Warehouse inputted and nothing else.

For example, I am working in Store "A" which has its own Warehouse "A" and I want to first check the availability of the item in my own store. This means that I actually want "Out of Stock" warning in quick avaiability check in case my item is not in the Warehouse of the Business Unit I am operating in (which is Store "A"). In case that I don't have the stock in my own warehouse, I choose Demand Class called "Store B" which would create an interorganization transfer (Store B → Store A) through sourcing rules. If the