The plea of inadmissibility of a claim brought by way of summary proceedings for payment on the ground of lack of jurisdiction of the court seized by reason of an arbitration clause agreed between the parties must be raised in a timely manner in the proceedings opposing the payment order and may not be raised belatedly at the stage of final submissions, beyond the time limit for the filing of written submissions under Article 171-ter of the Code of Civil Procedure, on pain of inadmissibility.