The ANSI X12 EDI 850 Purchase Order Transaction Set or simply, EDI 850 or PO is a fundamental document used when placing an order for goods or services. It is a formal request sent by the buyer, i.e., purchasing company to the supplier or seller for delivery of items at the agreed price. EDI 850 is one of the most commonly used supply chain documents in general merchandise while EDI 875, its counterpart is reserved for grocery items. This electronic purchase order should be a part of automated EDI to be utilized by a purchasing company to place an order to be shipped to a distribution center, store, or end-user. It can either contain a single ship-to location or multiple locations, such as cross-dock orders.