MD61: Factory calendar in planned Indep Requirmt

Hi Expert,

I would like to create planned independent requirment for a public holiday in MD61.

In our "factory calendar" the public holiday is a workday for production. How can i assign a new factory calendar to hte T-Code MD61.

If i change the standard factory calendar. What is the consequences.

Thanks for your quick reply and comments if there is others solution.