Procurement Orders represent the need for a certain quantity of products, at a given time, in a given location. Sales Orders are one typical source of Procurement Orders (but these are distinct documents). Depending on the procurement parameters and the product configuration, the procurement engine will attempt to satisfy the need by reserving products from stock, ordering products from a supplier, or passing a manufacturing order, etc. A Procurement Exception occurs when the system cannot find a way to fulfill a procurement. Some exceptions will resolve themselves automatically, but others require manual intervention (those are identified by a specific error message).