Rules applicable where the applicable legislation and/or the competence to grant family benefits changes

1.   Where the applicable legislation and/or the competence to grant family benefits change between Member States during a calendar month, irrespective of the payment dates of family benefits under the legislation of those Member States, the institution which has paid the family benefits by virtue of the legislation under which the benefits have been granted at the beginning of that month shall continue to do so until the end of the month in progress.
2.   It shall inform the institution of the other Member State or Member States concerned of the date on which it ceases to pay the family benefits in question. Payment of benefits from the other Member State or Member States concerned shall take effect from that date.