Service POs - Received Not Invoiced

I am trying to research service POs.  You know the kind, utility payments that get a service PO with a dollar amount that is supposed to cover a full year.  Each month when the utility's invoice comes in someone does an approval to release enough funds to cover the invoice.  That release reduces the amount of money left to cover the remaining months.

So what if someone gets lazy and says I'm going to relase all the remaining money.  When an invoice comes in it will get paid automatically and I won't be bothered.  We call this "received but not invoiced."  You may call it the same thing.