Article 7 (2) to (4) - Formal requirements applicable to agreements on the choice of applicable law
Spanish law lays down additional formal requirements for agreements on the choice of applicable law in accordance with Articles 7(2) to 7(4) of Regulation (EU) No 1259/2010, namely that the choice of applicable law must be agreed upon in an authentic instrument before a notary public or in an authentic document, which must be clearly and unmistakeably dated and signed by the parties, even if the document itself is not a notarial act.
Article 5 (3) - Possibility of designating the applicable law during the course of the proceeding
Under Spanish law, the spouses may not designate the applicable law before the court during the proceedings.