How to validate Projected End Date field from Effective Start Date

Summary:

Validation for Projected End Date less than the effective start date (Start Date)

Content (required):

The requirement is to not allow and show an error message when the user enter a Projected End Date that is less than the effective start date (Start Date) defined from the When and Why Section

Version (include the version you are using, if applicable):

23A

Code Snippet (add any code snippets that support your topic, if applicable):