How to Add an Error message using autocomplete rules.

Summary:

Add an Error message using autocomplete rules.

Content (please ensure you mask any confidential information):

Hello community,

Can anybody help me with adding a field validation rule to show an error message if an employee changed a goal status to in progress or completed before the goal start date?

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

23D

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