I am using the UPSXML contribution which is working well for products which have a weight assigned. I want to put some products in the catalog that customers can pre-order. Once we have enough orders (100) we will order the product from the supplier and delivery to the customer. I have entered the pre-order products in a separate category with a zero price and zero weight.
The problem I am having is that if a customer only orders products from the pre-order category, the UPSXML shipping module returns a cost for shipping, even though it has zero weight. I thought that by having a zero weight itwould return a zero shipping cost but it seems not.
Before I trawl through the shipping module code, can anyone give me any advice on how to approach this issue?