Can chained validators change form data when errors are present?

I tried to build a chained validator (FormValidator) which replaces some form data before
raising an Invalid exception (so that it is easier to display the wrong values). Unfortunately,
the data is not changed when I look at it in my main function.

I found the following in schema.py:
---------------------------------------------------------------
     for validator in self.chained_validators:
         new = validator.to_python(new, state)

     return new

finally:
     if state is not None:
         state.key = previous_key
         state.full_dict = previous_full_dict
---------------------------------------------------------------

Is there a way to change the form data in a chained validator when raising an Invalid exception?

fs

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