Sales Order

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The Sales Order, sometimes abbreviated as SO, is an order received by a business from a customer. A sales order may be for products and/or services. Given the wide variety of businesses, this means that the orders can be fulfilled in several ways. Broadly, the fulfillment modes, based on the relationship between the order receipt and production, are as follows

Build to Stock - Where products are built and stocked in anticipation of demand. Most products for the consumer would fall into this category
Build to Order - Where products are built based on orders received. This is most prevalent for custom parts.
Engineer to Order - Where some amount of product design work is done after receiving the order

A sales order is an internal document of the company, meaning it is generated by the company itself. A sales order should record the customer's originating purchase order which is an external document. Rather than using the customer's purchase order document, an internal sales order form allows the internal audit control of completeness to be monitored as a sequential sales order number can be used by the company for its sales order documents. The customer's PO is the originating document which triggers the creation of the sales order. A sales order, being an internal document, can therefore contain many customer purchase orders under it. In a manufacturing environment, a sales order can be converted into a work order to show that work is about to begin to manufacture, build or engineer the products the customer wants.