How to revert back the Customization done in NIR Definition Notification to Standard Notification

Summary: How to remove or undo customizations applied to a NIR Definition Notification and restore it back to the original standard notification provided by the system

Content (please ensure you mask any confidential information): Unable to remove or undo customizations applied to a NIR Definition.
Need the NIR header notification as New Item Request NIRXXX Requires Definition.

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

Oracle Fusion Cloud Applications25B (11.13.25.04.0)

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