I am trying to model a bio-polymer production process. I have created a data set for the production of polyol and a process for the production of the polymer (where the polyol is an input). However, it seems as the polyol production is never included in the polymer production no matter what I try (preferring default providers etc). I have tried to redo both the polyol process and the polymer process but no success. Any suggestions on what I might be doing wrong?