How do i close the PO with 3-way match where the ordered quantity matches the reciept quantity but n

Hi All,

We are currently facing a weird scenario where we had quotes from Vendor for 20k for OSP items processes (we are OPM enabled org). Based on the quote provided by the vendor on the price and the quantity (102) PO was approved. PO had only one line item and the entire quantity was received ( 3 way match). But after the period of 3/4 months we received invoice for a specific amount which ended up to be the amount for 45.65 quantity. The invoice was accidently approved without correcting the PO. So the PO reads ordered as 102, received 102