The po is generated. You must call purchasing and have them make the changes in the PO since the order is already processed.Slippery Rock University – SAP Purchasing Instructions. The last step in the purchase requisition process is a check on budget availability. Create the purchase order. If there is a purchase requisition, use it as a reference ( in Purchasing : Purchase order Create) Purchase Orders (items) for Fixed Assets are relevant for Purchase Order Accruals. Determine whether this statement is true or false.