The chosen characteristic is displayed on the order details page and the invoice.
In the PDF invoice, it is done with the code
if($group){
foreach($order->products as $j => $optionElement){
if($optionElement->order_product_option_parent_id != $product->order_product_id) continue;
$product->order_product_price +=$optionElement->order_product_price;
$product->order_product_tax +=$optionElement->order_product_tax;
$product->order_product_total_price+=$optionElement->order_product_total_price;
$product->order_product_total_price_no_vat+=$optionElement->order_product_total_price_no_vat;
?><br/><?php
echo $optionElement->order_product_name;
if($optionElement->order_product_price>0){
if($config->get('price_with_tax')){
echo ' ( + '.$currencyHelper->format($optionElement->order_product_price+$optionElement->order_product_tax,$order->order_currency_id).' )';
}else{
echo ' ( + '.$currencyHelper->format($optionElement->order_product_price,$order->order_currency_id).' )';
}
}
}
}
in the file plugins/hikashop/attachinvoice/attachinvoice/invoice.php
So I'm not sure what you're talking about.
Could you provide more information ? A link to a product page with such option, a screenshot of the order details page and of the invoice page and of the product edition page of the product would be great.