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Sadly, the HRMS API User Hook mechanism provides no means to throw warnings - it's just validation errors. All warnings are passed back as OUT parameters from the APIs, and the list is fixed - you can't change it.
You'll be looking at a customization by extending the OAF controller.
What I've done in the past is simply personalize on some instructional text at the top that always shows. It's not exactly a great solution but then customization isn't good either...