Yes it could be added to transfer transactions and the question is whether or not it should be.
The function was designed and implemented specifically for sales and service transactions as a way of communicating sales related information. The pop-up does not display on other transaction types such as purchase orders and RMAs.
So if it is added to transfer transactions, does it also get included in those other transaction types?
It has been added to the suggestion list and we will elicit feedback from the Atrex community.