The CASH RECEIPTS and the attributes added to the end of the SALES RELATIONS relation (i.e., Remit No and Remit Amt) substitute for the cash receipts data and RA data discussed in the preceding section. For simplicity, we have ignored customer cash discounts in the relations shown. First, note that Remit No in SALES INVOICES allows us to associate cash receipts with particular customers for the purpose of monitoring customer accounts and assessing any needed bad debt adjustments. In addition, Invoice No in SALES RELATIONS can be used to apply collections against specific open invoices (as in an open-item accounts receivable system, for instance). Finally, the linkages among CASH RECEIPTS, SALES RELATIONS, SALES INVOICES, and CUSTOMERS can be used to determine customer accounts receivable balances at any moment in time, as shown in the E- R diagram and explained previously.