EDI 810 (Invoice) is an X12 transaction set to send billing information for rendered goods and services as per customary and established business and industry practice.

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 855 (Purchase Order Acknowledgement) is an X12 transaction set used by sellers to send an acknowledgment to a buyer's purchase order as per customary and established business and industry practice. It can also be used to notify vendor-generated orders, which helps a buyer know if the seller has or will ship the order per pre-agreed terms.

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.