Hello,
Even if you creating a vendor custom field, the "display limited to" feature is related to the HikaShop core.
So you would have the same behavior with an address, product, category, order custom field.
Please open a new thread in the HikaShop section of the forum.
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.