Unable to make a descriptive flexfield mandatory through VB Studio business rule

Summary:

Unable to make a DFF required in performance document.

The required attribute in the VB Studio business rule is checked

but still the user is able to submit the document without providing

value in the DFF field.

Content (please ensure you mask any confidential information):

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

24D

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