diff --git a/tienda_ilusion/don_confiao/models.py b/tienda_ilusion/don_confiao/models.py
index 54a96f1..ca59980 100644
--- a/tienda_ilusion/don_confiao/models.py
+++ b/tienda_ilusion/don_confiao/models.py
@@ -83,8 +83,8 @@ class Sale(models.Model):
         return sum([l.quantity * l.unit_price for l in lines])
 
     def clean(self):
-        if self.payment_method not in [choice[0] for choice in PaymentMethods.choices]:
-            raise ValidationError({'payment_method': f"Null or invalid payment method ({self.payment_method}, {PaymentMethods.choices})"})
+        if self.payment_method not in PaymentMethods.values:
+            raise ValidationError({'payment_method': "Invalid payment method"})
 
     @classmethod
     def sale_header_csv(cls):