++++ Social security for migrant workers - Applicable legislation - Pensioners - Applicability of the legislation of the State of residence notwithstanding payment of the pension by another Member State - Whether permissible - Charging by the State of residence of contributions to cover benefits payable by the Member State paying the pension - Not permissible - Previous pursuit of a professional or trade activity in the State of residence - No effect (Regulation No 1408/71)