Hello,
Can you please edit your message in order to remove every single mention to HikaSerial and "attach serial" ?
Your issue is not related to HikaSerial at all and it's just that the content of your item fields are not stored.
By mentionnng HikaSerial you create a great confusion and that's not what you want !
Thank for your understanding.
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.