Consent and material validity
Article 24
1. The existence and validity of an agreement on choice of law or of any term thereof, shall be determined by the law which would govern it pursuant to Article 22 if the agreement or term were valid. 2. Nevertheless, a spouse may, in order to establish that he did not consent, rely upon the law of the country in which he has his habitual residence at the time the court is seised if it appears from the circumstances that it would not be reasonable to determine the effect of his conduct in accordance with the law specified in paragraph 1.