++++ 1 . AGRICULTURE - COMMON ORGANIZATION OF THE MARKETS - CEREALS - COMMON WHEAT, BARLEY, MAIZE AND RYE - THRESHOLD PRICE - CALCULATION - REDUCTION OF THE BASIC TARGET PRICE BY AN AMOUNT REPRESENTING THE INCIDENCE OF INTERNAL TAXATION LEVIED IN RESPECT OF IMPORTS ( REGULATION NO 19 OF THE COUNCIL, ARTICLE 4 ) 2 . AGRICULTURE - COMMON ORGANIZATION OF THE MARKETS - CEREALS - COMMON WHEAT, BARLEY, MAIZE AND RYE - THRESHOLD PRICE - CALCULATION - MISTAKE BY NATIONAL AUTHORITIES - POWERS OF THE COMMISSION - LIMITS ( REGULATION NO 19 OF THE COUNCIL, ARTICLE 4 )