Canon is rather inconsistent, as you’d expect. In MoR chapter 23 there’s this:
He’d put everything he had into the Finite Incantatem and it still wasn’t working.
Some hexes required specific counters or you couldn’t undo them, or maybe it was just that Draco was that much stronger.
Stuff like locks would obviously be protected, but Harry’s thoughts (“some”) suggests that it’s more of an exception.
Do we have an example of Finite being used to cancel anything other than transfigurations or first-year level spells (Somnium)?
Canon is rather inconsistent, as you’d expect. In MoR chapter 23 there’s this:
Stuff like locks would obviously be protected, but Harry’s thoughts (“some”) suggests that it’s more of an exception.