Load the commodities for Amounts in this object.

def load_commodities(self):
        """
        Load the commodities for Amounts in this object.
        """
        if isinstance(self.amount, Amount):
            self.amount = Amount("{0:.8f} {1}".format(self.amount.to_double(), self.currency))
        else:
            self.amount = Amount("{0:.8f} {1}".format(self.amount, self.currency))