public function save()
 {
     $project_id = phpgw::get_var('id');
     if ($project_id && is_numeric($project_id)) {
         $project = $this->so->get_single($project_id);
     } else {
         $project = new logistic_project();
     }
     $project->populate();
     if ($project->validate()) {
         $project_id = $this->so->store($project);
         $GLOBALS['phpgw']->redirect_link('/index.php', array('menuaction' => 'logistic.uiproject.view', 'id' => $project_id));
     } else {
         $this->edit($project);
     }
 }