I've seen three types of "Shogeg":
- You don't realize it was Shabbos - for this you bring a Chatas.
- You don't realize what you're doing is assur - for this you bring a Chatas.
- You don't realize what you're doing altogether (you think you're picking up a detached blade of grass but it turned out it was attached, in other words, you didn't realize you were Kotzer) - nothing, it's Misasek.
What about if one Shechts a Korban (Tamid/Mussaf) and it turned out to be a Treifa (so one needs to bring another one)?
You know it's Shabbos, you know it's assur to Shecht, and you know what you're doing, yet to call it Meizid is kind of hard. What's the halacha?