Hi,
Can you give me some details about your pack configuration ?
There is an option called "no user assign". If this option is activate the assignation of the user to the serial is not done.
Otherwise, the assignation should be made in the same time than the assignation with the 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.