Right now a client can have $250 in multiple overdue invoices. However it sends the client the email showing they owe $250 but only attaches the invoice that triggered the overdue invoice email. For example the overdue invoice that triggered may be $50 of the $200.

The client is left confused as to why it says $250 is owed yet only an invoice for $50 was emailed.

When it sends a message to a client about overdue invoices, it should grab any additional invoices that are overdue and attach them as well to let the client know exactly why the total is $250.