Hi

   I have a small project and I have been unable to get the following 
statement to work. Any help would great.User inputs can either 
self_sale_head which is a $ value,if a $ value is not add a 
self.estimated_weight_hd is used to get the total weight, the code below 
should return a estimated_weight_total which can be used for the total sale 
price. All works when I add the estimated_weight_total manually. I am lost 
as why.

def calc_estimated_weight_total(self):
    if self.sale_head <= 0:
        amount = (self.number * self.estimated_weight_hd)
        return amount
def save(self):
    self.estimated_total_weight = self.calc_estimated_weight_total()
    super(SaleNote, self).save()



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