If you use taxation in Parallels Business Automation - Standard and by the moment when the customer's order is already calculated but not paid yet (i.e., the corresponding invoice was not generated), the taxes have been changed, it is possible to recalculate the order (i.e., recreate it). If recalculation is needed, you will be prompted when trying to approve or pay an order and the Recreate button will appear on the screen showing an order details.