I don't have an example I can pull together at the moment, although I can try to do so. Let me try to help you work through your scenario, though.
Please do / answer the following:
- Change your JSP so that you are binding to "parent" (NOT "parent.id").
I have done this already - Display the form. Is the correct value selected from the list?
No, it's not - Submit the form. When the form redisplays, is the correct value selected from the list?
Nope. But that's because my success page is different. I know I told it was the same. My bad! Sorry.
Having clear answers to these questions will help make sure we're on the same page, and that I understand what you're trying.