If the question is mandatory, you have to answer ALL cells - obviously.
That's the meaning of "mandatory"
Otherwise you have to validate the question,
So check, that
ALL A1 are filled, A2 & A3 are filled if A1==1
Joffm
BTW: The question validation could be like this
(countif("1",self.sq_A1.NAOK)==count(self.sq_A2.NAOK)) and (countif("1",self.sq_A1.NAOK)==count(self.sq_A3.NAOK)) and count(self.sq_A1.NAOK)==sum(count(that.Q1.sq_1)*4,count(that.Q1.sq_2)*4,count(that.Q1.sq_3)*4,count(that.Q1.sq_4)*4,count(that.Q1.sq_5)*4)
and the validation tip (of course, it's up to you)
{if((countif("1",self.sq_A1.NAOK)!=count(self.sq_A2.NAOK)) or (countif("1",self.sq_A1.NAOK)!=count(self.sq_A3.NAOK)),'If you answered "Yes", please fill the whole row',if(count(self.sq_A1.NAOK)!=sum(count(that.Q1.sq_1)*4,count(that.Q1.sq_2)*4,count(that.Q1.sq_3)*4,count(that.Q1.sq_4)*4,count(that.Q1.sq_5)*4),'Please, answer each row!',''))}