public static server str getOutstanding()
{
    return strFmt("Sum(%1) + Sum(%2)",
            SysComputedColumn::returnField(
            tableStr(TIDIndentOrderUninvoiceTrans),
            identifierStr(TIDIndentOrderPaymentTrans),
            fieldStr(TIDIndentOrderPaymentTrans, amountTendered)),
            SysComputedColumn::returnField(
            tableStr(TIDIndentOrderUninvoiceTrans) ,
            identifierStr(TIDIndentOrderPaymentTrans),
            fieldStr(TIDIndentOrderPaymentTrans, grossAmount)));
}