The option for panel members to lie to earn some money?
There are certain scenarios where this can actually make sense. Of course not for the day of birth. I don't think you want people in your survey that can't even get their date of birth right....
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Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
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Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.