++++ Social security for migrant workers ° Invalidity insurance ° Calculation of benefits ° Legislation of a Member State fixing the amount of benefit on the basis of the remuneration last received ° Worker employed in another Member State at the time when invalidity occurred ° Taking into account, for calculation of the theoretical amount, of the remuneration last received in the State of employment (Regulation No 1408/71 of the Council, Art. 46(2)(a))