The+Questions+that they tend+A+to do+ascertain+the+nullity+or+the cancellation+of+a+contract,+i.e. the+not+correct+execution+of the+ratio,+with+consequences+in+point+of+compensation+of the+damage,+directly+connected+to the assessment+of the+vi zi+assumptions,+fall+in the+concept+of+any+controversy+inherent+the+validity,+the efficacy+e+execution+of the same+contract,+in+respect+to+criterion+interpretative+extensive+of which+in art.+808-quater+cod.+proc.+civ.