TAX PROVISIONS - HARMONIZATION OF LAWS - EXEMPTIONS FROM TURNOVER TAXES AND EXCISE DUTIES - GOODS CONTAINED IN THE PERSONAL LUGGAGE OF TRAVELLERS - REDUCTION IN EXEMPTIONS IN INTRA-COMMUNITY FRONTIER TRAFFIC - FRONTIER ZONE - DEFINITION ( COUNCIL DIRECTIVE 69/169 , ART . 5 ( 5 ), AS AMENDED BY DIRECTIVE 72/230 )