Change in Work Schedule Rule

Hello

I need one help

I have changed the WSR for a specific personnel area changing the time of the working hours, so now after changing the settings do I need to generate WSR Manually if yes do i need to create or change the existing one

When I tried to create giving claendar, ESG,WSR, it says its already exists.

what should I do Now to activate It

Kindly help

Thanks

Naveen