Hi,
It allows to reorder the entire selected order ; it reload all products, all item custom fields, all entries, the coupon code and it redirect the user to the checkout.
For sure, if they are restrictions or limitations, the new cart won't be the exact same than the previous order.
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.