When we return something and receive a vendor credit statement, upon trying to enter that invoice against the credit balance created by the PO receipt reversal, we get an error and the program ends. The status after this error is that no receiver exists and no invoice has been recorded. So, I have two questions...
 
Why does this program have a problem with negative invoice amounts?
 
How do I account for the credit, square away the vendor, and clear the POR/NI when it won't allow me to enter the invoice?