Hi,
Like Xavier said, there is no option to display the prices with and without taxes in the same time in the invoice.
If you want to display both, it will just display with but not without.
So if you want to display both, you have to customize the invoice in order to display both.
If you just want to display it with OR without, the invoice is working good, using the option in the configuration.
Or we have a little problem of comprehension.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.