1. Article 12(1) of the implementing Regulation shall apply mutatis mutandis to Article 61 of the basic Regulation. Without prejudice to the underlying obligations of the institutions involved, the person concerned may submit to the competent institution a document issued by the institution of the Member State to whose legislation he was subject in respect of his last activity as an employed or self-employed person specifying the periods completed under that legislation.
2. For the purposes of applying Article 62(3) of the basic Regulation, the competent institution of the Member State to whose legislation the person concerned was subject in respect of his/her last activity as an employed or self-employed person shall, without delay, at the request of the institution of the place of residence, provide it with all the information necessary to calculate unemployment benefits which can be obtained in the Member State where it is situated, in particular the salary or professional income received.
3. For the purposes of applying Article 62 of the basic Regulation and notwithstanding Article 63 thereof, the competent institution of a Member State whose legislation provides that the calculation of benefits varies with the number of members of the family shall also take into account the members of the family of the person concerned residing in another Member State as if they resided in the competent Member State. This provision shall not apply where, in the Member State of residence of members of the family, another person is entitled to unemployment benefits calculated on the basis of the number of members of the family.