Purchase Order Retransmit 

The Retransmit (PORT) document reprints a copy of the PO in the PDF format. You might need to resend the POs to your vendors for a variety of reasons.

Unlike the Print action, retransmitting gives you an opportunity to specify the content to be printed before you create the PDF. After the PDF version of the PO is displayed, you may then print it or retransmit it to the vendor.

Note: The retransmit button appears only when you are viewing a PO that is currently in 'Open' status. The button appears if the PO has already been printed or a transmission method other than 'Print' was selected.

More:

Document Layout

Process Overview