++++ 1 . Social security for migrant workers - Community legislation - Matters covered - Supplementary allowance paid to pensioners by a national solidarity fund - Inclusion ( Regulation No 1408/71 of the Council, Art . 4(1 ) ) 2 . Social security for migrant workers - Benefits - Residence clauses - Removal - Acquisition or maintenance of the right to benefits refused on account of residence in another Member State - Not permissible ( Regulation No 1408/71 of the Council, Art . 10(1 ) ) 3 . Social security for migrant workers - Community legislation - Implementation compulsory notwithstanding practical difficulties - Possibility of referral to the Administrative Commission on Social Security for Migrant Workers ( Regulation No 1408/71 of the Council, Art . 81(d ) ) 4 . Member States - Obligations - Not fulfilled - Proposal designed to terminate an infringement submitted to the Council - No effect