Enable Shipping for virtual products

[eretic]

Hello everybody,

 

How can I enable shipping for virtual products.

I already enable combination for virtual products with a tutorial found on this forum and now I want to find how to enable shipping for virtual products (shipping by weight is what I need).

 

If I want to sell books, I want to create virtual products and let the ability to customers to choose a combination between the paper one (~1Kg = shipping) or PDF one (0Kg = no shipping).

 

 

If someone know where is the part to modify on prestashop to enable shipping for virtual products, it could be very cool.

 

 

Thanks,

Cordially,