Bonjour,
La solution sera directement de modifier l'option "Show taxed prices" via "Hikashop->System->Configuration->Main" ou d'éditer le fichier "plugins/hikashop/attachinvoice/attachinvoice/invoice.php" via les lignes :
<tr>
<td colspan="3" class="newarea">
<?php echo JText::_( 'SHIPPING' ); ?>
</td>
<td class="price" >
<?php
if($config->get('price_with_tax')){
echo $currencyHelper->format($order->order_shipping_price,$order->order_currency_id);
}else{
echo $currencyHelper->format($order->order_shipping_price-@$order->order_shipping_tax,$order->order_currency_id);
} ?>
</td>
</tr>