You could use a callback for that. In Web2py you can register a function to be 
called before or after a certain database action is performed. Inside the 
function you can check for conditions and by returning True you can choose to 
abort the action.
See 
http://www.web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#callbacks-on-record-insert-delete-and-update
 for details.

-- 
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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