how to write onchange code

[NiharikaM859103]

If a user changes the caller in the incident form : Description should be the incident is
created by the user : caller full name , cmdb mandatory,state should be in progress.

[Ankur Bawiskar]

@NiharikaM859103 

so what did you start with and where are you stuck?

This is an easy requirement

Unless you start you won't learn.