Hi,
I have upload a new package and its contains the modification (So you would have to re-download HikaShop 2.0).
With the patch, if you add the order status "created" in the invoice statuses parameters, the invoice id and the invoice number would be the copy of the order id and the order number.
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.