[tryton] Delete Class Attributes

[Francisco Maria Moyano Casco]

Hi, 
   I'm working on Tryton 4-2. I'm trying to delete some class attributes, due 
to a migration, but I had no success.

   The code I use is the next one:
    ......
    if table.column_exist('water'):
        table.drop_column('water')           
        if hasattr(cls,'water'):
            del cls.water
    .......

    Any clue why this doesn't work?

    Thanks
         Francisco

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