In my store there are products that may be downloaded or shipped, and I use the Zone Rates for definig the shipping cost.
If I buy one or more "downoladable" products, there are no shippng cost (that's o.k.).

But if I add to the basket one "not downloadable" product, the shipping cost is not related to the weight of the only one "not downloadable" product, but to the weight of all the product that are in the basket.

How can avoid this? Thanks to all....