Products or services acquired or received numerous times over the course of a fiscal year should be ordered via an annual Purchase Order. Typical examples include monthly cell phone charges, recycling services, equipment leases, and maintenance renewal contracts.
A new requisition should be initiated at the beginning of each fiscal year (July) indicating the number of months (12) in the quantity box and the monthly charge in the unit price box. The annual Purchase Order allows a department to process one requisition and encumber the funds for the entire year instead of processing 12 separate requisitions.
You can be ahead of the game by submitting your annual RQ's in the middle of June.