Prepare Purchase Order. The Prepare Purchase Order function receives the purchase requisitions that are sorted by vendor if necessary. Next, a purchase order (PO) is prepared for each vendor, as illustrated in Figure 10.16. A copy of the PO is sent to the vendor. In addition, a copy is sent to the set up accounts payable (AP) function for filing temporarily in the AP pending file, and a blind copy is sent to the receive goods function, where it is held until the inventories arrive. The last copy is filed in the open/closed purchase order file.