I entered a PO invoice, under AP-C.  The GL transactions are showing that it is coming out of POs Received Not Invoiced and going into Account Payable GL accounts, like it should be.  The PO no longer shows up on the Received Not Invoiced report, which is should not.  However, it does not show up on the AP aging, and I don't know why.  If I try to go back into AP-C to re-enter the invoice, it does not tell me that the invoice number already exists and it also says that there are no receivers for this PO.  What should I do?  How do I find out what happened, and then get this invoice onto the AP aging so that I can pay it?