Noob here again, this might come off as an odd question to some of you here but I really need to verify this.
I think if you get certified in ISO 22000 then you're by definition certified in HACCP, but does it work the other way around too? Do you need to follow ISO 22000, and I'm specifically talking about the 2018 version, to get certified in HACCP? If not then what document describes the necessary requirements for HACCP?
Thank you!