[tryton] overriding _error_messages

[Francisco Maria Moyano Casco]

Hi,
   I'm using tryton 3.8. Is there anyway to override an _error_messages on a 
class extension?

   For example, in the original class I got this:

............
   @classmethod
   def __setup__(cls):
        super(My_class, cls).__setup__()
        cls._error_messages.update({
            'only_capital_letters':
                'You have to write the field on CAPITAL LETTERS',
        })     

..........

   On the extension, I need somthing like this (I know this is the wrong way):  
 
............
   @classmethod
   def __setup__(cls):
        super(My_class, cls).__setup__()
        cls._error_messages.update({
            'only_capital_letters': continue,                
        })
..........

   Thanks. Regards
             Francisco

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