Hi all,
I have a purchase order that was created for a vendor with no prepayment fields set up. I have received a purchase invoice from the vendor for prepayment of 50% value of the order.
I have adjusted the vendor card for a prepayment rate of 50%.
However, I cannot see how to create the prepayment invoice in the Purchase Order. I have navigated to Actions - Posting - Prepayments - Post Prepayment Invoice (see below)

but when i do, nothing happens:

How / where do I enter the details of the prepayment invoice?