Article 1
Open βUndertakings shall keep, and make available to the officials or agents of the High Authority carrying out checks or verifications as regards prices, business books and accounting documents including at least the following: (a) Records of orders with related correspondence filed in such a way as to permit checking; (b) In respect of each sale a copy of the invoice or any other written record established for accounting purposes which contains at least the following items of information: - name and address of the purchaser; - nature, quality and quantity of the product sold; - date of invoice and of delivery; - price and all other conditions of sale; such documents being filed in such a way as to enable the entries in the accounts to be checked; (c) A sales journal or any other accounting document in which all sales are entered in chronological order, showing at least the date of the contract for sale, the name of the customer or the invoice number, and the amounts payable; (d) A cash book recording in chronological order all receipts and payments with dates, names of purchasers and amounts, kept in such a way as to enable the cash balance to be checked at any time; (e) Statements of account and other documents relating to bank accounts and postal cheque accounts, separately for each financial establishment and in chronological order, kept in such a way as to enable the balance to be checked at any time; (f) Statements, receipts, bills and abstracts of account relating to payments and receipts, filed in such a way as to enable the cash book mentioned in subparagraph (d) to be verified; (g) Accounts for individual customers recording with dates all amounts due from and paid by customers ; separate accounts for customers need not be kept if such amounts with dates are recorded in the sales journal or other document mentioned in subparagraph (c).