Article 16 3.

The provisional determination of the applicable legislation, as provided for in paragraph 2, shall become definitive within two months of the institutions designated by the competent authorities of the Member States concerned being informed of it, in accordance with paragraph 2, unless the legislation has already been definitively determined on the basis of paragraph 4, or at least one of the institutions concerned informs the institution designated by the competent authority of the Member State of residence by the end of this two-month period that it cannot yet accept the determination or that it takes a different view on this.