The document discusses reversing receipts in two cases: 1) When a check payment bounces due to insufficient funds, the receipt is reversed and an invoice is opened to collect payment. 2) When a customer denies paying for insufficient funds, the receipt is reversed with a debit memo that is later cancelled by a credit memo, without opening an invoice since the debt is recognized as bad. It also defines balance forward billing as consolidated invoicing for transactions over a period using setups like billing cycles, payment terms, customer profiles and customer records.