diff --git a/product/ERP5/tests/testInvoice.py b/product/ERP5/tests/testInvoice.py
index 8879a81a09229276d195cfec402c207f1413520a..a299ebbc2bd61aca07ae345b0ba5602a008c6abb 100644
--- a/product/ERP5/tests/testInvoice.py
+++ b/product/ERP5/tests/testInvoice.py
@@ -135,7 +135,9 @@ class TestInvoiceMixin(TestPackingListMixin,
                    self.portal.sale_packing_list_module,
                    self.portal.purchase_packing_list_module,
                    self.portal.portal_simulation,):
-      folder.manage_delObjects(list(folder.objectIds()))
+      
+      folder.manage_delObjects([x for x in folder.objectIds() if x not in ('organisation_1','organisation_2')])
+     
     transaction.commit()
     self.tic()