++++ 1. Social security for migrant workers - Community rules - Scope ratione materiae - Allowance for physical disablement affecting mobility - Treated as an invalidity benefit where paid to a person who has been subject as an employed person to the legislation of the State granting it (Council Regulation No 1408/71, Art. 4(1)(b) ) 2. Social security for migrant workers - Benefits - Residence requirements - Waiver - Withdrawal of entitlement to invalidity benefit owing to residence of the beneficiary in another Member State - Not permissible (Council Regulation No 1408/71, Arts 4(1)(b) and 10(1) )