Sure. But that's not what I said.
But you can easily identify a level deeper - there must be a reason why the staff don't understand. Without addressing this root cause, there's no reason to expect that it won't happen again.
I'll accept that in many cases it is a contributing cause on the way to finding the root cause.
What concerned me was that I perceived that you meant training could not be part of the corrective action. I can clearly see now that is not what you had in mind.