style(Purchase)
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		@@ -83,8 +83,8 @@ class Sale(models.Model):
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        return sum([l.quantity * l.unit_price for l in lines])
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					        return sum([l.quantity * l.unit_price for l in lines])
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    def clean(self):
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					    def clean(self):
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        if self.payment_method not in [choice[0] for choice in PaymentMethods.choices]:
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					        if self.payment_method not in PaymentMethods.values:
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            raise ValidationError({'payment_method': f"Null or invalid payment method ({self.payment_method}, {PaymentMethods.choices})"})
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					            raise ValidationError({'payment_method': "Invalid payment method"})
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    @classmethod
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					    @classmethod
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    def sale_header_csv(cls):
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					    def sale_header_csv(cls):
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