Index: ticket.class.php
===================================================================
--- ticket.class.php	(revision 339)
+++ ticket.class.php	(working copy)
@@ -352,7 +352,14 @@
                   = PluginBehaviorsUser::getRequesterGroup($ticket->input['entities_id'],
                                                            $ticket->input['_users_id_requester'],
                                                            true);
-            } else {
+            } else  if ($config->getField('use_requester_user_group') == 3){
+               $user = new User();
+               if($user->getFromDB($ticket->input['_users_id_requester'])){
+                  $ticket->input['_groups_id_requester'] = $user->fields['groups_id'];
+               }else{
+                  $ticket->input['_groups_id_requester'] = 0;
+               }
+            } else  {
                // All groups
                $g = PluginBehaviorsUser::getRequesterGroup($ticket->input['entities_id'],
                                                            $ticket->input['_users_id_requester'],
@@ -611,6 +618,26 @@
                $_SESSION['glpi_behaviors_auto_group'] = $grp;
                $_REQUEST['_groups_id_requester']      = $grp;
 
+            } else if (($config->getField('use_requester_user_group') == 3)
+                       && isset($_POST['_users_id_requester']) && ($_POST['_users_id_requester'] > 0)
+                       && (!isset($_POST['_groups_id_requester'])
+                           || ($_POST['_groups_id_requester'] <= 0)
+                           || (isset($_SESSION['glpi_behaviors_auto_group'])
+                               && ($_SESSION['glpi_behaviors_auto_group']
+                                   == $_POST['_groups_id_requester'])))) {
+
+               // Select default group of this user
+               $user = new User();
+
+               if ($user->getFromDB($_POST['_users_id_requester'])) {
+                  $grp = $user->fields['groups_id'];
+               } else {
+                  $grp = 0;
+               }
+
+               $_SESSION['glpi_behaviors_auto_group'] = $grp;
+               $_REQUEST['_groups_id_requester']      = $grp;
+
             } else if (($config->getField('use_requester_user_group') == 1)
                 && isset($_POST['_users_id_requester']) && ($_POST['_users_id_requester'] <= 0)
                 && isset($_POST['_groups_id_requester'])
@@ -620,6 +647,15 @@
                // clear user, so clear group
                $_SESSION['glpi_behaviors_auto_group'] = 0;
                $_REQUEST['_groups_id_requester']      = 0;
+            } else if (($config->getField('use_requester_user_group') == 3)
+                       && isset($_POST['_users_id_requester']) && ($_POST['_users_id_requester'] <= 0)
+                       && isset($_POST['_groups_id_requester'])
+                       && isset($_SESSION['glpi_behaviors_auto_group'])
+                       && ($_SESSION['glpi_behaviors_auto_group'] == $_POST['_groups_id_requester'])) {
+
+               // clear user, so clear group
+               $_SESSION['glpi_behaviors_auto_group'] = 0;
+               $_REQUEST['_groups_id_requester']      = 0;
             } else {
                unset($_SESSION['glpi_behaviors_auto_group']);
             }