EDI 860 (Purchase Order Change Request) is an X12 transaction set to send the information regarding the changes in a purchase order as per customary and established business and industry practice. It can be used by a buyer to request a change in the previous purchase order (EDI 850) or to confirm the changes in the purchase order requested by a seller.

EDI 850 (Purchase Order) is an X12 transaction set to place a purchase order for goods or services with a vendor as per customary and established business and industry practice.

EDI 856 (Shipment/Manifest) is an X12 transaction set to send a list of contents of an order with additional information relating to the shipment. It includes information such as item name, description, characteristics, packaging type, carrier information, and equipment and configurations for the item for transportation. It helps the sender to describe the item and arrange a suitable shipment.