(3) Where a person has received social assistance under the legislation of one Party for a period for which that person subsequently becomes entitled to any benefit under the legislation of the other Party, the competent authority or the competent institution of the latter Party, at the request of and on behalf of the competent authority or the competent institution of the former Party, shall withhold the benefit due for that period and shall transmit the amount withheld to the competent authority or the competent institution of the former Party. The competent authority or the competent institution of the former Party shall deduct from the benefit due under the legislation of the other Party the amount by which the social assistance paid exceeded what would have been paid had the benefit under the legislation of the latter Party been paid before the amount of social assistance was determined. Any benefit not so deducted shall be transmitted to the person.