1 . TAX PROVISIONS - HARMONIZATION OF LAWS - TURNOVER TAXES - COMMON SYSTEM OF VALUE ADDED TAX - SIXTH DIRECTIVE - TERRITORIAL SCOPE - SUPPLY OF SERVICES - PRINCIPLE - EXCEPTIONS ( COUNCIL DIRECTIVE NO 77/388/EEC , ARTS 2 , 3 AND 9 ) 2 . TAX PROVISIONS - HARMONIZATION OF LAWS - TURNOVER TAXES - COMMON SYSTEM OF VALUE ADDED TAX - SIXTH DIRECTIVE - TERRITORIAL SCOPE - TAXATION BY A MEMBER STATE OF TRANSPORT SERVICES EFFECTED BETWEEN TWO POINTS WITHIN THE NATIONAL TERRITORY BUT PARTLY OUTSIDE THAT TERRITORY - PERMISSIBILITY - CONDITION - NO ENCROACHMENT ON THE TAX JURISDICTION OF OTHER STATES ( EEC TREATY , ART . 227 ; COUNCIL DIRECTIVE NO 77/388/EEC , ARTS 3 AND 9 ( 2 ) ( B ))