I need some assistance as i am learning the rules & validation of nintex forms.
I have a drop down field say example consists of option 1,2,3. Say for example you click on the "2" you are required to click on the check box to ensure the document is added.
How do i place a validation on the drop down when it equals 2, to make the check box mandatory?
if you want to make check box mandatory, it's better option to assign rule to the check box itself, so that user visually see what control is problem with - controls that do not pass validation are enclosed with red border.
(however, it will work even if you assign it to dropdown)
your validation rule condition should look like: