Approval With mandatory Comment

Hello

I'm trying to make the approval comment field mandatory for a DCM. The idea is that  the approval cannot be approved or rejected if a comment hasn't been added to the section. That is, all approvals need to have a comment added to them.

I try to marked the comment as obligatory in the object "Basevisa" but it didnt work. 

Any idea how can I make the comment mandatory. 

Thank you