Hi there,
Am not saying this is necessarily the text book way to do it, but after looking for a solution to the same problem as you, and not finding it, thought I'd give it a bash myself...
So, we are editing -
/shop/admin/invoice.php
Find the line that says -
<td class="main"><?php echo zen_address_format($order->customer['format_id'], $order->billing, 1, '',
and change to -
<td class="pageheading"><?php echo zen_address_format($order->customer['format_id'], $order->billing, 1, '',
and find -
<td class="main"><?php echo zen_address_format($order->delivery['format_id'], $order->delivery, 1, '',
and change it to -
<td class="pageheading"><?php echo zen_address_format($order->delivery['format_id'], $order->delivery, 1, '',
I'd presume you could do the same trick on the on the packing slip file i.e. change "main" to "pageheading" (Though of course youre prob meant to do this in C.S.S.)
You can also ad VAT numbers etc., on the invoice by editing this file
Any language changes to invoice are in -
/shop/admin/includes/languages/english
Hope this helps,
SK