Index: workflow.views.inc
===================================================================
--- workflow.views.inc	(revision 281)
+++ workflow.views.inc	(working copy)
@@ -118,6 +118,15 @@
     ),
   );
 
+  // time
+  $data['workflow_node']['workflow_transition_year_month'] = array(
+    'title' => t('Workflow transition year + month'),
+    'help' => t('In the form of YYYYMM.'),
+    'argument' => array(
+      'field' => 'stamp',
+      'handler' => 'views_handler_argument_node_created_year_month',
+    ),
+  );
 
   // time
   $data['workflow_scheduled_transition']['scheduled'] = array(