Hello,

Even if I ask 'madatory', the user can check several boxes in the same row. Or he can check no boxes in the same  row, and the whole question is accepted as a good answered ...
I would like that a box grid question with several row admit only one checked box per row, no more, no less to make the whole grid question as a valid one. How is it peossible ?

Thank you for help,    Hugues