Ai+senses+of art.+819-ter+code+proc.+Civ.,+”La+sentence,+with+the+which+the+judge+states+or+denies+the+own+competence+in+relationship+a+a+convention+of arbitration ,+it is+challengeable+to+standard+of the+articles+42+and+43 “. ++ in the+case+of+decree+injunction+revoked+in+reason+of the+competence+referee,+is+applicable+the+recall o+art.+42+of the Italian Civil Code+civ.,+e+therefore+the+provision+of+first+grade+is+only+contestable+with+regulation+of+competence,+expected+that+the+declaration+of+nullity +of the+decree+injunctive+not+it can be considered+one+pronunciation+on the+merit,+being+the+mere+and+necessary+consequence+of the+declaration+of+incompetence+of the+judge+session.