Reload wizard start data.

gistfile1.py

    # Updated, try to use the existing state if possible otherwise use the model defaults.
    def default_start(self, fields):
        LookupConfig = Pool().get('product_lookup.lookup.config')
        if self.start.forecast_date:
            defaults['forecast_date'] = self.start.forecast_date
        else:
            defaults['forecast_date'] = LookupConfig.default_forecast_date()
        return defaults

gistfile2.pytb

Traceback (most recent call last):
  File "/trytond/protocols/jsonrpc.py", line 123, in _marshaled_dispatch
    response['result'] = dispatch_method(method, params)
  File "/trytond/protocols/jsonrpc.py", line 156, in _dispatch
    res = dispatch(*args)
  File "/trytond/protocols/dispatcher.py", line 154, in dispatch
    result = rpc.result(meth(*args, **kwargs))
  File "/trytond/wizard/wizard.py", line 259, in execute
    return wizard._execute(state_name)
  File "/trytond/wizard/wizard.py", line 271, in _execute
    view['fields'].keys())
  File "/trytond/wizard/wizard.py", line 87, in get_defaults
    defaults.update(default(fields))
  File "/trytond/modules/product_lookup_stock/lookup.py", line 65, in default_start
    if self.start.forecast_date:
  File "/trytond/model/model.py", line 629, in __getattr__
    % (self.__name__, name, self._values))
AttributeError: 'product_lookup.lookup.config' Model has no attribute 'forecast_date': None

gistfile3.py

# Extends the original ModelView defined in another module.
class LookupConfig:

    __name__ = 'product_lookup.lookup.config'

    forecast_date = fields.Date(
        'At Date', help='Compute the expected '\
            'stock quantities for this date.\n'\
            '* An empty value is an infinite date in the future.\n'\
            '* A date in the past will provide historical values.')

    @staticmethod
    def default_forecast_date():
        Date = Pool().get('ir.date')
        return Date.today()