TAX PROVISIONS - HARMONIZATION OF LEGISLATION - TURNOVER TAXES - COMMON SYSTEM OF VALUE-ADDED TAX - SUPPLY OF GOODS - PRODUCTION OF GOODS FROM CUSTOMERS ' MATERIALS - CONCEPT - REPAIRS - EXCLUDED ( COUNCIL DIRECTIVES 67/228 , ART . 5 ( 2 ) ( D ), AND 77/338 , ART . 5 ( 5 ) ( A ))