Best way to autofill related fields (ADF Faces - ADF BC )

Hi,
I have the following database structure:
Restaurant (RestId*, RestName, ..)
|1
|
|n
Categories (CatId*, RestId (FK), CatName, CatOrder,..)
I am trying to implement the Categories page as follows (sorry for the layout but was the best I could do with text based interface...):
Restaurant
| RestId | | RestName |
Categories List
Select Category Name
| o | CatId#1 | CatName#1 |
| o | CatId#2 | CatName#2 |
Category Detail
| CatId |
| CatName |
| CatOrder |
| Commit | | Rollback | | Create | | Delete |
Autofill Functionality:
1. After leaving the RestId input field RestName and Categories List gets populated. (For this I will be using the autoSubmit feature).
2. If the user enters a wrong RestId (not in table restaurant) an error should be raised and user shouldn't be allowed to leave RestId field until it has the correct value.
Question:
Which is the best way of achieving such functionality having most part of the code at the ADF BC Layer ? It would be nice to have all validations inferred as they are when you define them at the Entity Object Layer.
Thanks,
Claudio.

see section 9.6.2 "Implementing an Efficient Existence Check" to perform your existence check validation.

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regards
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ps
Of course, we also have formal Oracle University Training courses which you could attend (or they can be purchased to watch on line).

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