slapos_erp5: show latest consistency error

master/bt5/slapos_erp5/TestTemplateItem/portal_components/test.erp5.testSlapOSERP5VirtualMasterScenario.py

@@ -42,10 +42,11 @@ class TestSlapOSVirtualMasterScenario(DefaultScenarioMixin):
 
   def stepcheckERP5Consistency(self):
     not_consistent_document = self.portal.portal_catalog.getResultValue(
-      consistency_error=1
+      consistency_error=1,
+      sort_on=[('modification_date', 'DESC')]
     )
     if not_consistent_document is not None:
-      assert not_consistent_document.checkConsistency() == []
+      assert not_consistent_document.checkConsistency() == [], not_consistent_document.checkConsistency()[0]
 
   def test_virtual_master_without_accounting_scenario(self):
     # create a default project