The "COPY ONLY" text is displayed because the "Final Invoice" button has already been clicked.
You should notice that the Status of the invoice is either Sent or Updated.


If the Status of the invoice is Entered or Approved, the text will be "DRAFT ONLY".

The only time that neither of these text values displays is when the "Final Invoice" button is clicked.

If you want to print the invoice without this text, then click the Reopen button (if it is Sent), then approve the invoice, and then click the Final Invoice button.

OR

the original invoice without any text should also be an attachment