OK, that's the problem discussed in the "Validators with dependencies" 
paragraph of the book. It took me some time to realize that. From what I've 
read from other developers, it's not possible to solve this in the model if 
I understand well, even if the book says so. I'll solve this by adding the 
IS_IN_DB validator at the controller level.

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Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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