Article 1
1. Producers shall be subject to the co-responsibility levy provided for in Article 4 and to the additional co-responsibility levy provided for in Article 4b (2) of Regulation (EEC) No 2727/75 in respect of the quantities of the cereals specified in Article 1 (a) and (b) of that Regulation placed on the market, with the exception of the quantities of seed grain which are to be certified in accordance with Council Directive 66/402/EEC (5) and sold as seed without prejudice to the second subparagraph of Article 9 (1). 2. For the purposes of this Regulation 'placing on the market' means sales (including barter operations) by producers to collection, trading and processing undertakings, to other producers and to the intervention agency. The following shall be treated as placing on the market: - the processing of cereals delivered or made available to an undertaking by a producer (work under contract) with a view either to subsequent use on his holding or to sale. 'Processing', for the purposes of this subparagraph, means any treatment of grain such that the product obtained may no longer be classified under the headings of the combined nomenclature referred to in Article 1 (a) and (b) of Regulation (EEC) No 2727/75, with the exception of the crushing of maize cobs harvested for immediate ensilage on an agricultural holding; - the acceptance by a producer of a warrant of entitlement for the delivery of his cereals to a recognized storage depot in the framework of a forward transaction (London Grain Futures Market).