A Purchase Order Invoice is a document that is used to request goods or services from a vendor. It is typically issued by the buyer and serves as a legal offer to purchase specific goods or services at a predetermined price. The purchase order includes the quantity and description of the goods or services, the delivery date, and any other terms and conditions that may apply. The vendor then sends an invoice to the buyer, which serves as a record of the purchase. The invoice typically includes the cost of the goods or services, any applicable taxes, and any other fees associated with the purchase. The invoice also serves as a record of payment and is used to track the payment status of the order. The purchase order invoice is an important document in the business world, as it serves as a record of the transaction and helps to ensure that the buyer and seller are both in agreement on the terms of the purchase.