Please provide some kind of indicator in the Client Statement Invoices & Payments section for those invoices which are currently Overdue. This indicator could be a color change or some text symbol for the Overdue items, along with a footnote explaining the indicator.
Ideally, any invoices currently Outstanding could be displayed in boldface to distinguish them from ones already Paid. When a single payment covers more than one invoice, the payment information in the statement merely states that a payment was made for that client without specifying which invoices were covered. It can be confusing to reconcile which are the open invoices in the statement without resorting to individual invoices.