Article 7 (2) to (4) - Formal requirements applicable to agreements on the choice of applicable law
No further formal requirements apply to agreements on the choice of applicable law other than those provided for in Article 7(1) of Regulation (EU) No 1259/2010.
Article 5 (3) - Possibility of designating the applicable law during the course of the proceeding
The latest time spouses can choose the applicable law is at the trial preparation stage, within the deadline set by the court.