I am shocked and disappointed account right does not have the ability to send invoice reminders on a continuous basis if the invoice remains outstanding. The schedule configuration sends the invoice reminder as a once off eg if it is set to be sent at 30days after the due date it will however it will not re send this in another 30days if the invoice remains outstanding.
Also, when viewing the history of the invoice to see sent dates etc the scheduled reminder's do not list in this view, this is not user friendly when following up outstanding invoices with clients the history is vital during client communication re efforts to have invoices paid etc.