tpartner wrote:
And if you set "single choice" question type not mandatory : user can choose 'No answer' and see other question ?
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Another solution:
- short text question type with validation : count(Q1.NAOK,Q2.NAOK,Q3.NAOK)==1
- Text display questiuon type with relevance count(Q1.NAOK,Q2.NAOK,Q3.NAOK)>=1 and text "You must choose only one answer"
Then user can select any answer he want, BUT can not go to next group with more than one answer selected
I recommend using something other than single-choice. Once one is selected it cannot be deselected so the respondent has no opportunity to choose another question.
Seems to be desired behaviour ?And if you set "single choice" question type not mandatory : user can choose 'No answer' and see other question ?
Answer one of the question (depends on me which one)
Then I lose the opportunity answer another question at this question group and go to the next question group.
Then I lose the opportunity answer another question at this question group and go to the next question group.

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Another solution:
- short text question type with validation : count(Q1.NAOK,Q2.NAOK,Q3.NAOK)==1
- Text display questiuon type with relevance count(Q1.NAOK,Q2.NAOK,Q3.NAOK)>=1 and text "You must choose only one answer"
Then user can select any answer he want, BUT can not go to next group with more than one answer selected
