Special Rules In Factory Calander and Scheduling Constraint Dates

Hello Experts,

I have a scenario wherein I have defined special rules eg ( 26th to 29th Dec 2017 are non work days) , it shows on in calendar. But when I schedule a task in PPM Project on those days the task gets scheduled ( this is not the case on a holiday though eg 25th Dec is defined as Christmas, so if I schedule a task it automatically gets pushed to 26th). Is there any steps I am missing in defining special rules.

With Regards,

Nachiket Joshi