Updating the SMS/SCCM sender address "SMS_SiteControlDaySchedule" value from script trick ...
If you are trying to update the "SMS_SiteControlDaySchedule" on an SMS/SCCM Address from a script, but the attribute "HourUsage" will not be saved... then you have to be aware to set the attribute "Update" to "True" on each changed "SMS_SiteControlDaySchedule" Object.... otherwise the changes will not be saved...