how to set Requisition DFF conditionally mandatory in RSSP

Summary:

Our customer want to set a DFF as mandatory for [Urgent] PR I know we can set Requisition DFF conditionally mandatory using sand box like attachment.

But I want to confirm how to set Requisition DFF conditionally mandatory in RSSP

Content (please ensure you mask any confidential information):

want to set DFF mandatory only if [Urgent] check box is checked

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

24C

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