Definition of sales order: sales order is a kind of sales agreement signed between enterprises and customers, which realizes the communication between enterprises and customers, realizes the requirements of customers for goods for sale, and is also the sales commitment of enterprises to customers; It is the first step of the substantive function of the sales management system, connecting the sales contract and delivering it to the sales delivery. Through the maintenance and management of order information, the planned control of sales is realized, and the sales activities, production activities and procurement activities of enterprises are in an orderly, smooth and efficient state.

A sales order is a contract.