I am using openerp7

I have created one sale order with two lines with product1 and product 2.

For product1 I want to do drop shipping : Means I will not handle the inventory for that perticular product in my warehouse. (My supplier will directly deliver the product)

For product2 invetory will come to my stock then i will deliver (Normal process we are doing in OpenERP).

I need dropshipping per order line where one product is normal and another is dropship in one Sale Order.

What should be the configuration ????