Pay on Receipt - AP Invoice

Hi,
I have a below scenarios

I am raising PO with Match option "Receipt" with 4 way matching

My PO qty i.e Order qty is 10
My Receipt qty is 5
Since it is 4 way, i inspect the qty and I Accept and deliver 4 qty and reject 1 qty.

Now, i run pay on receipt which creates AP Invoice automatically. However the invoice is created for the receipt qty not the delivered qty i.e in the above case invoice is for 5 qty where as Delivered qty is 4.

Can some share inputs on how to create AP invoice for Delivered Qty.

Thanks
Ajith