Today, when a prepayment or a standard invoice is posted on a PO invoice, if others prepayment not paid yet exist, then they are reversed in order to never be paid too late. And so, even if the prepayment gonna be paid soon, for example if it's in a vendor payment journal not posted yet.

We would like to add an alert message when posting a prepayment or standard invoice on a PO where another prepayment not paid yet exist, just to inform the user.