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Sales invoices are prepared in batches on a daily basis using numbered sales invoices. Sales invoice numbers are automatically generated by the company’s computer system. The accounts receivable clerk does not have appropriate computer rights to override the computer-generated invoice number. Upon preparing sales invoices, the accounts receivable clerk verifies that the first invoice number of the batch is consistent with the last invoice number of the previous batch. Inconsistencies or skipped sales invoice numbers are investigated and resolved before new sales invoices are prepared. The items shipped are compared to the items billed for proper quantity, price, and other sales order terms. The accounting department supervisor compares and reconciles a copy of the daily sales invoice batch report to the daily accounts posting report indicating the individual accounts. The daily account posting report is prepared and sent by the accounts receivable department. Discrepancies are investigated and resolved to help assure that the customer subsidiary accounts are posted for the same total amount posted to the control account. At the end of each month, the total of the trial balance of customer account balances (prepared by the accounts receivable department) are reconciled to the general ledger control account by the accounting department supervisor.