diff --git a/relation.module b/relation.module
index 654573f..f2fdf9f 100644
--- relation.module
+++ relation.module
@@ -589,12 +589,24 @@ function relation_save($relation) {
   }
   else {
     $keys = array();
+    $relation->changed = time();
+    $relation->created = time();
     $op = 'insert';
   }
   field_attach_presave('relation', $relation);
   module_invoke_all('entity_presave', $relation, 'relation');
   drupal_write_record('relation', $relation, $keys);
+  // for update relation, unset vid avoid duplicate vid in relation_revision table.
+  if (isset($relation->vid)) {
+    unset($relation->vid);
+  }
   drupal_write_record('relation_revision', $relation);
+  // update vid to relation table.
+  db_update('relation')
+        ->fields(array('vid' => $relation->vid))
+        ->condition('rid', $relation->rid)
+        ->execute();
+
   call_user_func("field_attach_$op", 'relation', $relation);
   module_invoke_all('entity_' . $op, $relation, 'relation');
   module_invoke('rules', 'invoke_event', 'relation_' . $op, $relation);