Hi,
There is no such option in HikaShop but it is something you can do in a view override or by using a custom plugin.
In the view override you can add some checks in the "step" in order to not displaying the "next" button and displaying a warning message instead.
By a custom plugin, you can refuse order creation (before their creation) if the cart quantity is not right.
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.