A PO number is assigned once it is submitted for approval. Until the requisition has been approved and printed it can still be edited. From the “My Requisitions” menu highlight the appropriate requisition and click the “Edit” button to make changes.
To ensure that a requisition remains unprinted for the longest time, enter your requisition at the start of the day. The business office typically approves and prints purchase orders at the end of the day, so if you enter a requisition at 8:00am that will likely give you 7 hours to receive an updated price and be able to update the amount on your requisition.
Once a requisition has been approved and printed, it cannot be updated; however, accounts payable will pay the vendor based on the invoiced amount and not the dollars listed on the purchase order.