Import products and identify them by supplier + supplier reference

We do get pricefiles from our suppliers and when we want to import them into Prestashop its not always possible to use EAN or reference. But something we always do get in the pricefiles are supplierID and supplier reference.

Today its only possible to import using supplier reference. This is a good start but this is not 100% safe cause different suppliers might have the same supplier reference which would overwrite all found occurencies in database - even though they dont belong to that supplier.

http://prntscr.com/u35t9j

So please add possibility to identify products by "supplier + supplier reference".

Thanks