My typical scenario ordering manufacturing of the product involves initial PO sent by the supplier and I am paying 50% of that. When manufacturing is completed and inspected, I pay the rest, but due to the fluctuation of exchange rates, various conditions on a supplier side, total PO amount changes. On top of it - shipping has to be accounted for as COG, but I do not know exact shipping charge until shipment is ready to be shipped (i.e. after I paid 100% full).
Is there a way to incorporate such fluidity of real-life business and still keep track of COGs? I see I can change qty of products ordered in existing PO, but I can’t seem to find out a way to change Taxes and Charges entries without canceling all the payments, PO and redoing everything from scratch.