Thank goodness we started to focus on problem. I still think we could use the present invoice as it, IF the following were changed:
1. when multiple items are purchased, shipping method should be dropped from all items (obviously 50 lb of stuff will not go airmail in an envelope).
2. Allow draft copy of invoice to be produced so buyer/seller can negotiate the shipping method.
Does that cover all the problems we have? Would those changes make the present invoice more user friendly and flexible enough to accomodate more than one item?