As of Release 3.0, you can use a purchase order to post materials from a vendor to the stock provided to a subcontractor.
Vendor 1 is a subcontractor. To produce a particular material, he requires certain components in his SC stock.
Vendor 2 is to deliver these components to vendor 1 direct.
In this instance, you enter a standard purchase order for vendor 2. When entering the item data, select Item -> More functions -> Delivery address. A box will be displayed in which you enter the receiving vendor (vendor 1) and set the indicator SC vendor.
When vendor 2 reports delivery of the components, post the goods receipt for the purchase order. The components are posted directly to the stock of material provided to vendor 1.