Hi,
To edit the HikaShop views, the best is to use the HikaShop interface under "Display > Views" (Vizualliza > Aspetto).
Then you can filter the views by context (frontend / backend), by template etc.
So you have to select "backend", your backend template (isis) and then edit the "product / form" view.
HikaShop will create the view override in the right folder for you.
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.