In a product system, connections to processes are always crossing each other. On the screenshot, one can see that “terrace building” is connected to “excavation, hydraulic” and “Natural stone plate”. Because inputs are listed in alphabetical order, the best would be that “excavation, hydraulic” is displayed above “Natural stone plate”, so connections don’t have to cross each other. This happens naturally and need to be changed per hand if we want to have a nicer and easier to understand graph. This happens also when there is more than 2 connections (see left of screenshot).