Undertaking as referred to in Article 7 (1) of Regulation (EEC) No 804/68 shall be approved only if they: ... (b) undertake to keep permanent records, in the form determined by the competent agency of each Member State, listing the origin of the raw materials, the quantities of skimmed-milk powder, buttermilk and whey treated, the type of heat-treatment for the skimmed milk, the quantities of products obtained, the packaging and identification of each lot of skimmed-milk powder, buttermilk powder and whey powder and the date on which it left the plant ...