diff --git a/kfet/models.py b/kfet/models.py
index 69098ac9..07b56f2e 100644
--- a/kfet/models.py
+++ b/kfet/models.py
@@ -633,11 +633,17 @@ class Settings(models.Model):
         cache.set('OVERDRAFT_AMOUNT', overdraft_amount)
         return  overdraft_amount
 
+    @staticmethod
     def CANCEL_DURATION():
+        cancel_duration = cache.get('CANCEL_DURATION')
+        if cancel_duration:
+            return cancel_duration
         try:
-            return Settings.setting_inst("CANCEL_DURATION").value_duration
+            cancel_duration = Settings.setting_inst("CANCEL_DURATION").value_duration
         except Settings.DoesNotExist:
-            return timedelta()
+            cancel_duration = timedelta()
+        cache.set('CANCEL_DURATION', cancel_duration)
+        return cancel_duration
 
     @staticmethod
     def create_missing():
@@ -667,6 +673,7 @@ class Settings(models.Model):
     def empty_cache():
         cache.delete_many([
             'SUBVENTION_COF','OVERDRAFT_DURATION', 'OVERDRAFT_AMOUNT',
+            'CANCEL_DURATION',
         ])
 
 class GenericTeamToken(models.Model):
diff --git a/kfet/views.py b/kfet/views.py
index f2f98f8f..f7f8728e 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -1075,10 +1075,10 @@ def kpsul_cancel_operations(request):
             #        Note : si InventoryArticle est maj par .save(), stock_error
             #        est recalculé automatiquement
             if ope.article and ope.article_nb:
-                last_stock = (ArticleInventory.objects
+                last_stock = (InventoryArticle.objects
                     .select_related('inventory')
                     .filter(article=ope.article)
-                    .order_by('at')
+                    .order_by('inventory__at')
                     .last())
                 if not last_stock or last_stock.inventory.at < ope.group.at:
                     to_articles_stocks[ope.article] += ope.article_nb