++++ 1 . PROCEDURE - OBLIGATIONS OF THE MEMBER STATES OF THE EEC - FAILURE TO FULFIL THOSE OBLIGATIONS - POWERS OF THE COMMISSION - PROCEDURES FOR OBTAINING DEROGATIONS - NO EFFECT UPON THE EXERCISE OF THOSE POWERS ( EEC TREATY, ARTICLES 169, 226 ) 2 . OBLIGATIONS OF MEMBER STATES OF THE EEC - FAILURE TO FULFIL THOSE OBLIGATIONS - REQUEST FOR A POSTERIORI DEROGATION - EFFECT 3 . CUSTOMS DUTIES - ELIMINATION - PROHIBITION OF THE CREATION OF NEW DUTIES - STRICT NATURE OF THIS PROHIBITION ( EEC TREATY, ARTICLES 9, 12 ) 4 . CUSTOMS DUTIES - ELIMINATION - CHARGES HAVING EQUIVALENT EFFECT - CONCEPT ( EEC TREATY, ARTICLES 9, 12 ) 5 . POLICY OF THE EEC - COMMON RULES - TAX PROVISIONS - TAXATION WITHIN THE MEANING OF ARTICLE 95 OF THE EEC TREATY - SCOPE OF THAT ARTICLE 6 . COMMON MARKET - COMMUNITY PROCEDURES - UNILATERAL DECISIONS TO BE AVOIDED