AGRICULTURE - COMMON ORGANIZATION OF THE MARKETS - BEEF AND VEAL - YOUNG MALE BOVINE INTENDED FOR FATTENING - IMPORT QUOTA AT A REDUCED RATE OF LEVY - BENEFICIARIES - AGRICULTURAL PRODUCERS - CONCEPT - DEFINITION BY MEMBER STATES - RESTRICTION TO FARMERS PRACTISING FARMING AS THEIR MAIN OCCUPATION - PERMISSIBILITY ( COMMISSION REGULATION ( EEC ) NO 2902/77 , ART . 1 ( 5 ), COUNCIL DIRECTIVE NO 72/159 )