Redwood: How to make a field editable based on another field value in VBS

Summary:

We plan to make the School Name field read-only if the school field is not null, while keeping it editable if the school field is null. However, our attempt to implement this through a business rule did not work as expected. I have attached screenshot on what we need to achieve.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable): 25B

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