Attempting to set a rounding method from NULL results in this warning:

What kind of unexpected behavior are we talking about here? Can it change existing data? Or is it just that subsequent returns on a pre-existing invoice may not match up?
Attempting to set a rounding method from NULL results in this warning:

What kind of unexpected behavior are we talking about here? Can it change existing data? Or is it just that subsequent returns on a pre-existing invoice may not match up?