This suggestion is for the POS to provide a warning when the inventory of an item you are trying to sell is zero (as represented in D365 on-hand amounts). This will warn that the inventory of that item will go into the negative. Also, some companies may not want inventory to ever go negative, in which case it would be convenient to be able to block a sale of an item with zero inventory at the POS. This feature would not be used in the case that a customer already has the product in their hands before purchase, however, in a case where product inventory is tightly controlled and is stored behind the counter or in a back room it would be quite useful to prevent or warn about the sale of zero inventory items. In this case, the inventory problem could be discovered at the POS right away and then the company could take steps to fix it.