diff --git a/cotisations/models.py b/cotisations/models.py
index 10aa868e..cdf73a39 100644
--- a/cotisations/models.py
+++ b/cotisations/models.py
@@ -88,6 +88,11 @@ class Facture(RevMixin, AclMixin, FieldPermissionModelMixin, models.Model):
             ("change_all_facture", "Superdroit, peut modifier toutes les factures"),
         )
 
+    def linked_objects(self):
+        """Return linked objects : machine and domain.
+        Usefull in history display"""
+        return self.vente_set.all()
+
     def prix(self):
         """Renvoie le prix brut sans les quantités. Méthode
         dépréciée"""
diff --git a/cotisations/views.py b/cotisations/views.py
index 6bf58994..b78a82f5 100644
--- a/cotisations/views.py
+++ b/cotisations/views.py
@@ -251,8 +251,7 @@ def edit_facture(request, facture, factureid):
     if facture_form.is_valid() and vente_form.is_valid():
         if facture_form.changed_data:
             facture_form.save()
-        if vente_form.changed_data:
-            vente_form.save()
+        vente_form.save()
         messages.success(request, "La facture a bien été modifiée")
         return redirect(reverse('cotisations:index'))
     return form({
diff --git a/machines/models.py b/machines/models.py
index c7d9fe83..dc2dba65 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -27,6 +27,7 @@ from datetime import timedelta
 import re
 from netaddr import mac_bare, EUI, IPSet, IPRange, IPNetwork, IPAddress
 from ipaddress import IPv6Address
+from itertools import chain
 
 from django.db import models
 from django.db.models.signals import post_save, post_delete
@@ -72,6 +73,11 @@ class Machine(RevMixin, FieldPermissionModelMixin, models.Model):
         """
         return Machine.objects.get(pk=machineid)
 
+    def linked_objects(self):
+        """Return linked objects : machine and domain.
+        Usefull in history display"""
+        return chain(self.interface_set.all(), Domain.objects.filter(interface_parent__in=self.interface_set.all()))
+
     @staticmethod
     def can_change_user(user_request, *args, **kwargs):
         """Checks if an user is allowed to change the user who owns a