In+theme+of+arbitration+between+a+professional+professional+and+a+consumer,+the+derogation+to+competence+of the+judicial authority+in+favor+of the referees,+is+admissible+where+it comes+the existence+one+specific+negotiation+between+l E+parts,+test+the+which+burden+falls+on the+professional+that+intends+use+of the+clause+arbitration+in+derogation+and+which detects+which+logically element+priest+to the+demonstration+of the+nature+not+vexatious+of the+clause.