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 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.

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 830 (Planning Schedule with Release Capability) is an X12 transaction set used for exchanging forecast/material release information between organizations as per customary and established business practices.

EDI 824 (Application Advice) is an X12 transaction set to report results after edits have been made in an application system's database. The edits made in transaction sets can be reported in the functional group, a part of the transaction set, or a different transaction set. The result can be coded or free-format. EDI 824 is only used when there is a need to report acceptance, rejection, partial acceptance, or changes in a transaction set. It is not used as a response to another transaction set.