The invoice is in the front and the outbound order is in the back. The sales business process of the enterprise is as follows: the sales department receives the product variety and quantity that the customer wants, and informs the production department to produce; After acceptance by the Quality Control Department, it will be put into storage by the warehousing department, which will feed back to the sales department; After the sales department notifies the customer to remit money or pay cash, the sales department issues an invoice, the customer loads the goods according to the invoice, and the warehousing department issues a product outbound order according to the invoice.