Art.+817,+co.+2,+Cod.+Proc.+Civ.+Provides+the burden+per+the+part+that intends+to contest+the+potestas+iudicandi+of the+referees+of+propose+the relative+exception+in the+first+defense+subsequent+to the acceptance+of the assignment. ++ the espresso+of the+standard+also+at the+contest. Actions+that+assume+the non -existence+of the+convention+of+arbitration+not+leave+doubts+on the fact+that a+similar+burden+ricada+also+on+chi+contexts+in+root+the+subsistence+of the+potestas+ludicandi+of the+referees+for+lack+a+clause+arbitration. ++ remains,+confined+to the +only+scope+of art.+806+Cod.+proc.+civ.+the+content+of the only+exception+to+this+rule,+having to understand+for+controversies+not+arbitrators+those+the+the+law+as+not+compromisable,+compared to+which+the+derogation+general+discipline+ A+Proposition+of the exception+finds+justification+in the intent+of the+legislator+of+attribute+to+rights+unavailable+or+of the+workers+(in the+hypotheses+provided by+second+paragraph+of the+regulation)+a+protection+strengthened+because it is entrusted+to+guarantees+of the+ordinary jurisdiction.