As a general rule, I stay away from house
code A1. (For that matter, I don't use
house code A at all but that's another
story.) When your battery gets weak in your
motion detector, it may reset to A1. After
that, Murphy rules.
Actually I do have an A1 macro. It blinks
the lights instead of the regular dimming.
That way I know when when batteries need to
be replaced.