Why can't I click the calendar button in my exceptions rota?

If you have edited exception rota, the calendar button will block itself so you don't lose your changes if you attempt to go to another date.

The right steps to follow to edit your exceptions rota in multiple dates are:

1.- Add your new exceptions. (Dark green in the image below)

2.- Before moving to another date, click the blue “Save” button so your exceptions are saved and calendar is enabled.