Question
How to write Custom Validator on Change Request/Notice?
How to write a custom UI validator that runs on a Change Request, when 'New->Create New Change Notice' is clicked, can we use preUIValidation that checks the state of the Change request, and throw an error message/warning in the UI if state is 'Under Review', and it should let users create Change Notice when state is 'Implemented'.
What are the files that need to be customized to achieve this?

