++++ 1 . Agriculture - Common organization of the markets - Cereals - Co-responsibility levy - Processing cereals from other Member States - Calculation of the levy - "Green" exchange rate applicable - Rate applicable in the Member State in whose territory the first-stage processing was carried out ( Commission Regulation No 2040/86, Art . 2 ( 1 ) ) 2 . Agriculture - Common organization of the markets - Cereals - Co-responsibility levy - Payment by the undertakings which carry out first-stage processing - Entire amount to be passed on to their suppliers ( Council Regulation No 2727/75, Art . 4 ( 6 ), as amended by Regulation No 1579/86; Commission Regulation No 2040/86, Art . 5 ( 1 ) ) 3 . Agriculture - Common organization of the markets - Cereals - Co-responsibility levy - Variations in the amount of the levy depending on the State in which first-stage processing is carried out - Variations inherent in the system of "green" exchange rates - Infringement of the prohibition of obstacles to the free movement of goods - Absence - Discrimination between producers - Absence ( EEC Treaty, Arts 12, 16, 34 and 40 ( 3 ); Council Regulation No 1676/85, Art . 2 ( 1 ) )