diff --git a/cotisations/models.py b/cotisations/models.py
index c6b7cd1c..8350850c 100644
--- a/cotisations/models.py
+++ b/cotisations/models.py
@@ -212,10 +212,10 @@ class Facture(BaseInvoice):
     def can_change_control(user_request, *_args, **_kwargs):
         """ Returns True if the user can change the 'controlled' status of
         this invoice """
-        return (
-            user_request.has_perm('cotisations.change_facture_control'),
-            _("You don't have the right to edit the \"controlled\" state.")
-        )
+        if user_request.has_perm('cotisations.change_facture_control'):
+            return True, None
+        else:
+            return False, _("You don't have the right to edit the \"controlled\" state.")
 
     @staticmethod
     def can_create(user_request, *_args, **_kwargs):
@@ -679,12 +679,10 @@ class Article(RevMixin, AclMixin, models.Model):
             A boolean stating if usage is granted and an explanation
             message if the boolean is `False`.
         """
-        return (
-            self.available_for_everyone
-            or user.has_perm('cotisations.buy_every_article')
-            or user.has_perm('cotisations.add_facture'),
-            _("You can't buy this article.")
-        )
+        if self.available_for_everyone or user.has_perm('cotisations.buy_every_article') or user.has_perm('cotisations.add_facture'):
+            return True, None
+        else:
+            return False, _("You can't buy this article.")
 
     @classmethod
     def find_allowed_articles(cls, user, target_user):
@@ -834,12 +832,10 @@ class Paiement(RevMixin, AclMixin, models.Model):
             A boolean stating if usage is granted and an explanation
             message if the boolean is `False`.
         """
-        return (
-            self.available_for_everyone
-            or user.has_perm('cotisations.use_every_payment')
-            or user.has_perm('cotisations.add_facture'),
-            _("You can't use this payment method.")
-        )
+        if self.available_for_everyone or user.has_perm('cotisations.use_every_payment') or user.has_perm('cotisations.add_facture'):
+            return True, None
+        else:
+            return False, _("You can't use this payment method.")
 
     @classmethod
     def find_allowed_payments(cls, user):
diff --git a/machines/models.py b/machines/models.py
index 61834149..4d14818b 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -105,8 +105,10 @@ class Machine(RevMixin, FieldPermissionModelMixin, models.Model):
             A tuple with a boolean stating if edition is allowed and an
             explanation message.
         """
-        return (user_request.has_perm('machines.change_machine_user'),
-                _("You don't have the right to change the machine's user."))
+        if user_request.has_perm('machines.change_machine_user'):
+            return True, None
+        else:
+            return False, _("You don't have the right to change the machine's user.")
 
     @staticmethod
     def can_view_all(user_request, *_args, **_kwargs):
@@ -1245,8 +1247,10 @@ class Interface(RevMixin, AclMixin, FieldPermissionModelMixin, models.Model):
     def can_change_machine(user_request, *_args, **_kwargs):
         """Check if a user can change the machine associated with an
         Interface object """
-        return (user_request.has_perm('machines.change_interface_machine'),
-                _("Permission required to edit the machine."))
+        if user_request.has_perm('machines.change_interface_machine'):
+            return True, None
+        else:
+            return False, _("Permission required to edit the machine.")
 
     def can_edit(self, user_request, *args, **kwargs):
         """Verifie que l'user a les bons droits infra pour editer
@@ -1350,9 +1354,10 @@ class Ipv6List(RevMixin, AclMixin, FieldPermissionModelMixin, models.Model):
     @staticmethod
     def can_change_slaac_ip(user_request, *_args, **_kwargs):
         """ Check if a user can change the slaac value """
-        return (user_request.has_perm('machines.change_ipv6list_slaac_ip'),
-                _("Permission required to change the SLAAC value of an IPv6"
-                  " address"))
+        if user_request.has_perm('machines.change_ipv6list_slaac_ip'):
+            return True, None
+        else:
+            return False, _("Permission required to change the SLAAC value of an IPv6 address")
 
     def can_edit(self, user_request, *args, **kwargs):
         """Verifie que l'user a les bons droits infra pour editer