Frontend Invoice Printing Do not show custom field

-- HikaShop version -- : 4.3
-- Joomla version -- : 3.9
-- PHP version -- : 5.6

We have a problem that although we have ticked "invoice" option for custom field of product

The value only shown in backend invoice printing view

Frontend order detail view is showing, but invoice printing view do not show

is it something we miss out?

Hi,

I checked the code of the view file which displays the invoice and the order details view (it's the same view file for both) and I don't see any reason a custom product field would show for the details page and not the invoice.
Check if you have the file templates/html/com_hikashop/order/show.php via FTP.
If you have it, rename it temporarily and check the situation on an order again.
If it displays fine, it means that it comes from some modifications done on your end in that view file override.
So I would recommend to redo the override in the backend and check the situation each time you do a modification so that you can find which modification is causing the problem.