Confusion when Receiving Payments

I'm posting this because my wife is continually getting confused when using the Receive Payments window.

When she opens up 'Create Invoices', and she would press 'Prev' to get the last created invoice.  However, she then opens up 'Receive Payments' she presses 'Prev' by instinct, and expects to get the last invoice created.  Ofcourse, we know this is not true, and instead you get the last payment received.  After observing that the name of the customer is not correct, she then proceeds to edit the details of the Receive Payment window... thinking that she is creating a new payment entry, when in fact she is editing the old one.

Then when she clicks Save (and clicks through the warning), we have just lost an old payment.

I know this is as designed, but in my opinion, it really shows the weakness of the whole "Prev/Next" buttons in the invoice and payments windows.