Many of our clients as part of monthly review require an aged receivable report which contain all open invoices and credit notes, some require it in detail while others in summary (summed at customer level). After speaking to technical support such report does not exist with the Unpaid Invoice report only available in detail (which is quite long for some customers) and does not include open credit notes.
Such a report is critical function of measuring business success and is offered as standard in many accounting applications
"aged receivables report"