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I would not know of an immediate solution rather than to split it to different questions using conditions
c_schmitz: ok. Maybe we'll see this in the next version of LimeSurvey?
you can use the Expression Manager to check both answers and set a question validation equation which shows a meaningsful error message when these two are selected
oh, okay. Is there a newbie-friendly way to implement this idea?
the last example here shows how to use custom question validation:
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