++++ 1 . COMMUNITY LAW - DIRECT EFFECT - NATIONAL TAXES INCOMPATIBLE WITH COMMUNITY LAW - REPAYMENT - PROCEDURES - APPLICATION OF NATIONAL LAW - CONSIDERATION OF ANY PASSING ON OF THE TAX - PERMISSIBILITY - UNLAWFULNESS OF CERTAIN REQUIREMENTS OF PROOF UNDER WHICH THE TAXPAYER HAS TO PROVE THAT HE HAS NOT PASSED THE TAX ON 2 . MEMBER STATES - OBLIGATIONS - FAILURE TO FULFIL - MAINTENANCE OF A NATIONAL PROVISION INCOMPATIBLE WITH COMMUNITY LAW