++++ 1 . Agriculture - Common organization of the markets - Milk and milk products - Additional levy on milk - Determination of reference quantities exempt from the levy - Special rules in favour of producers who have adopted milk production development plans - Allocation of a single fixed quantity - Not permissible - Exclusion of producers who have exceeded a given ceiling of deliveries - Permissible ( Council Regulation No 857/84, Art . 3 ( 1 ) ) 2 . Agriculture - Common organization of the markets - Milk and milk products - Additional levy on milk - Choice of formula B - Producers who have adopted milk production development plans - Allocation of a specific reference quantity - Re-allocation by the purchaser to certain of his affiliated producers of quantities freed by others - Permissible - Conditions ( EEC Treaty, Art . 40 ( 3 ), second subparagraph; Council Regulation No 857/84, Art . 3 ( 1 ) ) 3 . Agriculture - Common organization of the markets - Milk and milk products - Additional levy on milk - Determination of reference quantities exempt from the levy - Producers who have adopted milk production development plans - Subject to a general reduction of reference quantities - Infringement of the principle of the protection of legitimate expectations - None ( Council Regulations Nos 856/84 and 857/84 )