That you know of, or yet.
I got ya fam. This is it. 
As a rule, you should only modify things in Epicor via the business objects.
There are certainly exceptions to this, but unless you are super duper sure of yourself, you should steer clear, and do tracing, and mimic the way Epicor does it.
Good enough? â Tongue in cheek, but the advice is not. You do not want to kick yourself later. Ask me how I know.