May I know what’s wrong with my constraint syntax to prevent selecting “None” and any other option in a select_multiple question type but it’s not working at all.: not(selected(.,‘None’) and count-selected(.)>1)

@solotheking , this post discussed previously should help you solve your issue: [image] How to add multiple constraints (none and declined to answer) for multiple choice question Form Building You could do the same as outlined in the image below: In the survey tab of your…