diff --git a/counter/migrations/0013_customer_recorded_products.py b/counter/migrations/0013_customer_recorded_products.py
index 6365e8b4..73dad556 100644
--- a/counter/migrations/0013_customer_recorded_products.py
+++ b/counter/migrations/0013_customer_recorded_products.py
@@ -11,6 +11,7 @@ from counter.models import Customer, Product, Selling, Counter
 
 def balance_ecocups(apps, schema_editor):
     for customer in Customer.objects.all():
+        customer.recorded_products = 0
         for selling in customer.buyings.filter(product__id__in=[settings.SITH_RECORD_PRODUCT, settings.SITH_UNRECORD_PRODUCT]).all():
             if selling.product.id == settings.SITH_RECORD_PRODUCT:
                 customer.recorded_products -= selling.quantity
@@ -21,7 +22,7 @@ def balance_ecocups(apps, schema_editor):
             cons = Product.objects.get(id=settings.SITH_RECORD_PRODUCT)
             Selling(label=_("Record regularization"), product=cons, unit_price=cons.selling_price,
                     club=cons.club, counter=Counter.objects.filter(name='Foyer').first(),
-                    quantity=qt, seller=User.objects.get(id=0), customer=customer).save()
+                    quantity=qt, seller=User.objects.get(id=0), customer=customer).save(allow_negative=True)
             customer.recorded_products -= qt
             customer.save()
 
diff --git a/counter/models.py b/counter/models.py
index b9850e19..674a7b13 100644
--- a/counter/models.py
+++ b/counter/models.py
@@ -80,8 +80,8 @@ class Customer(models.Model):
             letter = random.choice(string.ascii_lowercase)
         return number + letter
 
-    def save(self, *args, **kwargs):
-        if self.amount < 0:
+    def save(self, allow_negative=False, is_purchase=False, *args, **kwargs):
+        if self.amount < 0 and (is_purchase and not allow_negative):
             raise ValidationError(_("Not enough money"))
         super(Customer, self).save(*args, **kwargs)
 
@@ -392,13 +392,13 @@ class Selling(models.Model):
             html_message=message_html
         )
 
-    def save(self, *args, **kwargs):
+    def save(self, allow_negative=False, *args, **kwargs):
         if not self.date:
             self.date = timezone.now()
         self.full_clean()
         if not self.is_validated:
             self.customer.amount -= self.quantity * self.unit_price
-            self.customer.save()
+            self.customer.save(allow_negative=allow_negative, is_purchase=True)
             self.is_validated = True
         u = User.objects.filter(id=self.customer.user.id).first()
         if u.was_subscribed: