when we send a PO for approval, so the aprover wants to see in the notification about the supplier note that what the purchaser has written on it. and the aprover wants to see that note on his first page of notification and the aprover don't want to navigate further for the note to supplier.
Sorry that is not possible. The approver will have to click on a few things. He can open the PO using the "Open document" link
If you are using PDF for PO communication, the PDF is attached to the notification and it has the note in it.