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How to restrict number of choices in multiple_choices

Question asked by nicsi76 on Feb 19, 2016
Latest reply on Feb 20, 2016 by ichivite-esristaff

Next question: How can I restrict the number of choices in a multiple_choices field to for example three? I found that this count-selected(.)<=3. (found it here:…)

should work but it does not for me. I also tried count-selected<=3 (without the dots), but also that does not work. Andy ideas?