1.The producer or producers' organization referred to in Article 3 (1) shall issue to the processor, at the time of each sale, a written attestation which shall include the name of the vendor, the name of the purchaser, the quantity and the price of products covered by the sale, and shall state that this quantity is part of the eligible quantity allocated to the producer or producers' organization in accordance with Article 3 (1).The producer or producers' organization in question shall forward a copy of this attestation without delay to the Member State which fixed the eligible quantity.