In order to generate a purchase order from a sales order, you need to follow the path Procurement -> Purchase Order -> Generate PO from So (Aurocon). Fill in the following fields: Business Partner, Representative, Warehouse and Delivery Terms.
Click on Search. In the section below, a list of the registered sales orders will be displayed. Select an order if you wish to generate the purchase orders from a certain sales order.
Press on Process to start the process. A window will displayed indicating the number of created purchase orders.
Note: The purchase order will be generated for those products that are linked to a vendor.