diff --git a/kfet/views.py b/kfet/views.py
index e87dde9b..3c78601f 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -1119,7 +1119,7 @@ def kpsul_perform_operations(request):
         ope_data = {
             'id': operation.pk, 'type': operation.type, 'amount': operation.amount,
             'addcost_amount': operation.addcost_amount,
-            'addcost_for__trigramme': is_addcost and addcost_for.trigramme or None,
+            'addcost_for__trigramme': operation.addcost_for and addcost_for.trigramme or None,
             'article__name': operation.article and operation.article.name or None,
             'article_nb': operation.article_nb,
             'group_id': operationgroup.pk,