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Yudi,
I have seen the code you're referring to in one of your samples.
However, it's largely irrelevant - I am using the Entity Framework for persistence as I've indiciated in my original post.
The true example of how to do validation is in the ClientUI SL Business App with RIA SP1 template.
I finally figured out that it wasn't working because I hadn't assigned an error string in my validation attribute - it should have a default one but well, it doesn't.
Georgios
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