I am a quite new Unisim user, and I am not very familiar with all the different options and facilities the software provides. But I have made a flowsheet of a Delayed Coker Unit for my Master Thesis, and now I want to use the Case Studies Tool (Databook) to investigate combined effects of changing the variables within given ranges.
After some trying and error, I have had good help to find the right way to get Reflux Ratio as an independent variable, together with Bottom Product Rate. But after I have added these variables to the case study and inserted the correct high- and low values, the "Start"-button is still inactive. What do I have to do to get the Case study to run, anyone have any idea?

Thank you for reading,
M