so you want validation to occur if either 0 or 1 are selected?
then change the code to:
(((isset($_POST["APPTS"]) && ($_POST["APPTS"] == "1" || $_POST["APPTS"] == "0")))?$_POST["apptCompany"]:"NA")
the NA value is just there to force it to pass validation of the apptCompany field does not need to be validated.