1 . PRELIMINARY RULINGS - JURISDICTION OF THE COURT - SCOPE - QUESTION OF JURISDICTION ARISING WITHIN THE NATIONAL JUDICIAL SYSTEM - ANSWER DEPENDS ON THE DEFINITION OF A LEGAL SITUATION BASED ON COMMUNITY LAW - UTILITY OF A PRELIMINARY RULING ( EEC TREATY , ART . 177 ) 2 . AGRICULTURE - COMMON ORGANIZATION OF THE MARKETS - MILK AND MILK PRODUCTS - CO-RESPONSIBILITY LEVY - NATURE - MEASURE TO STABILIZE THE MARKET ( COUNCIL REGULATION NO 1079/77 , ART . 5 ; COMMISSION REGULATION NO 1822/77 ) 3.AGRICULTURE - COMMON ORGANIZATION OF THE MARKETS - MILK AND MILK PRODUCTS - CO-RESPONSIBILITY LEVY - FIXING - CALCULATION BY REFERENCE TO THE TARGET PRICE FOR MILK - PERMISSIBLE ( EEC TREATY , ART . 40 ( 3 ), 3RD PARA ; COUNCIL REGULATION NO 1079/77 , ART . 2 ) 4 . AGRICULTURE - COMMON ORGANIZATION OF THE MARKETS - DISCRIMINATION BETWEEN PRODUCERS OR CONSUMERS - CO-RESPONSIBILITY LEVY IN THE MILK SECTOR - DETERMINED ON THE BASIS OF OBJECTIVE RULES FORMULATED TO MEET THE NEEDS OF THE COMMON ORGANIZATION OF THE MARKET - DIFFERENT EFFECTS ON DIFFERENT PRODUCERS - NO DISCRIMINATION ( EEC TREATY , ART . 40 ( 3 ), 2ND PARA .)