Hi, I am trying to build a training diary that should prompt an error message whenever public holidays are being selected. For example , there are 10 public holidays in a year. I need an error message to be prompted while choosing any of the 10 days. How do I use these dates in my formula conditions?
For example, the dates given below are public holidays.
What condition / function do I need to use to trigger a message when any of these dates are selected from the model calendar?