Hi,
As you can see, HikaShop does not allow you to buy the variant which does not exist.
But because you are using the characteristic value "red" and also the "7in" ; the dropdown contains that values
And because you can select all values in these dropdown, you can create combinations which might not exist.
That's why HikaShop display you that "no stock" message.
So, there is no bug and nothing to "fix".
www.hikashop.com/support/support/documen...ig.html#main_product
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.