2017 premium. What is the cost hierarchy in sales order? For example, if an item that is FIFO valuation, is entered and there is 0 quantity on hand, what cost is used? Is there any documentation on the KB? I looked and didn't find any. I believe it is ave cost, and if ave cost is 0 then standard cost. Is this correct? I have a client that insists it should be using standard cost but it is using average cost.