Gentlemen,
Please note that parent nozzle diameter is not converted to metric for a nozle conected to another nozzle. That prevents calculations when EN-13445 code is selected.
Please check and advise.

Dear Marian,

Thanks for alerting us regarding this problem. We will fix it. But, here is the work around, in the child nozzle dialog, put the parent nozzle's thickness in the input field "Local Shell thickness" thickness. Then this thickness will be used in the calculation for the parent nozzle. Then use the results after analyzing the file.

We will also address the Quick Calculation results for the child nozzle.