Invoicing Plan Last Payment Notice

Hello,

  We are using invoicing plan in Purchase Orders.

My Client wants to get an alert before the last payment is due, i.e.:

If there are 12 payments, the system should give some kind of alert after the 11th payment and before the last one.

Is there a standard way to do it (by customization, for example)? If not, do you an idea how to develop such an alert?

Regards,

Rami Kleiman