Thanks for the response Hari. In the above scenario, as script is in userworkform which also gets loaded for every case direct call to the function worked and makes sense.

I have come across few rules where function in Run Script is of the form pega.u.d.......

Ex: In pyUserDashboardHeader section, in the right corner cell we can find similar reference.

So wanted to understand what that means and is there any format to call a function.