A Purchase Order is a document issued by the contracting agent authorizing a purchase transaction with a vendor to provide or perform goods or services to the contracting unit, which, when fulfilled in accordance with the terms and conditions of a request of a contracting agent and other provisions and procedures that may be established by the contracting unit, will result in payment by the contracting unit.

Purchase Orders are entered into the Finance system which encumbers funds against appropriate department budgets, the encumbrance process ensures budget accounts are not over expended.