EBS R12.1.3 - Personalization's on form PERWSHRG-412 (combined person & assign)

Hello,

I'm wanting to do a personalization on the Assignment form for 1) 7 required data fields and 2) error thrown when data is missing.

Where can I find an explanation of what the Trigger Events are and how they work?

I can get a new hire to test correctly with 1 trigger event and I can get a re-hire to test correctly with a different trigger event - I would like to use 1 event for both scenarios (if possible).

I'm not having much luck reading thru the OAF guide so I'm hoping there might be a white paper on how this trigger event works.