Hi,
why didn't you use an array(numbers) with checkbox-display?
Then you enter in subquestion relevance equation:
(count(self.sq_SQ001)<4) AND
(count(self.sq_SQ002)<4) AND
(count(self.sq_SQ003)<4) AND
(count(self.sq_SQ004)<4) AND
(count(self.sq_SQ005)<4)
And add a useful tip like:
{if(((count(self.sq_SQ001)>3) OR
(count(self.sq_SQ002)>3) OR
(count(self.sq_SQ003)>3) OR
(count(self.sq_SQ004)>3) OR
(count(self.sq_SQ005)>3)),"Please enter only 3 per row","")}
That's all
Joffm