Part 4: Attachments Glossary ERP (Enterprise Resource Planning): An integrated system for managing all of a company's resources and business processes. SO (Sales Order): Document confirming an order from a customer before goods are shipped. PO (Purchase Order):  An official order document sent to a supplier BOM (Bill of Materials):  A list of raw materials ("recipe") used to make a product. Stocktaking:  The proccess of physically counting inventory in a warehouse. PR (Purchase Request):  An internal request document for the procurement of goods/services. Delivery Note: A document accompanying the shipment of goods.