An alarm mode schedule should NOT be allowed to LOWER the alarm status from “Away and Armed” to a lower level (such as “Home and Armed” or “Disarmed”).
The reasons are obvious.
For example, consider a scenario where you have an alarm mode schedule that turns off your alarm each morning so that you can retrieve the newspaper from your driveway. If you need to run an errand earlier than that time, you would not want to set the alarm manually, then discover it had been turned off by an alarm mode schedule – leaving your home unprotected.
Another example would be a scenario where you have an alarm mode schedule that changes your alarm status from “Disarmed” to “Home and Armed”. If you needed to run an errand, you would not want to set the alarm manually, then discover that your alarm status had been changed to a lower level of security while you were gone.