Hi Selim
Our scenario is like this:
Customer placing subcontracting order for material XYZ against contract manufacturer (CM). Then customer is supplying the some of the components required to manufacture XYZ material. CM is also procuring some of the components from his suppliers which goes into assembly of XYZ material along with customer supplied components.
Now parts which CM is procuring from his suppliers are not maintained in customer SAP system but since those are critical parts and customer wants to have visibility of stock for these parts on SNI monitor.
So how CM will upload the stock of these parts on SNI monitor if material code is not available in customer SAP system? Also option you suggested of manual creation of product master in SNC wont be available for suppliers.
Regards