The use of Conditions to calculate/populate a (hidden) field as the uni

The use of Conditions to calculate/populate a (hidden) field as the unique question seems very powerful. I can see examples where this works with text, dates, etc. But when I try to populate the filed based on an ID plus the selected value in Single Choice List, it doesn't work. The value coming from the Single Choice object is always "0", even though it is properly stored later. Any idea why?? https://www.jotform.com/build/81774622909870

To clarify, you want to assign a unique value to "Wein-Farbe", but it always returns a 0 value? Would you mind providing us with more details on how you want your form works with this unique ID.

Looking forward for your response.