@property
def proxy_map(self):
    custom_proxy_map = super().proxy_map
    custom_proxy_map[self.PERCENTAGE] = get_class('offer.benefits', 'CustomPercentageDiscountBenefit')
    custom_proxy_map[self.FIXED_PRICE] = get_class('offer.benefits', 'CustomFixedPriceBenefit')
    custom_proxy_map[self.FIXED_PER_PRODUCT] = get_class('offer.benefits', 'CustomAbsoluteDiscountPerProductBenefit')
    return custom_proxy_map
@property
def proxy_map(self):
    custom_proxy_map = super().proxy_map
    custom_proxy_map[self.PERCENTAGE] = get_class('offer.benefits', 'CustomPercentageDiscountBenefit')
    custom_proxy_map[self.FIXED_PRICE] = get_class('offer.benefits', 'CustomFixedPriceBenefit')
    custom_proxy_map[self.FIXED_PER_PRODUCT] = get_class('offer.benefits', 'CustomAbsoluteDiscountPerProductBenefit')
    return custom_proxy_map