Prepayment Invoices

We are currently running NAV 5.0 (5.0 SP1). We are trying to use prepayments. The problem is the order does not automatically go to “Release” status once the prepayment invoice is paid in full. According to the documentation this is how it is supposed to work. I asked our partner if there was a fix and they told me Microsoft just recommended customers not use this option. We want to use this option. Does anyone know of a “fix” or “patch” available to have the order status change to “released” when the prepayment invoice is paid in full?