/**
  * Returns relationships base on a module
  * @param $baseModule
  * @param $relationName
  * @param string $rel_type
  * @return null
  */
 protected function getRelationshipData($baseModule, $relationName, $rel_type = 'all')
 {
     if (empty($this->relatedModules[$baseModule])) {
         $this->relatedModules[$baseModule] = array("all" => array(), "one-to-one" => array(), "one-to-many" => array());
     }
     if (empty($this->relatedModules[$baseModule][$rel_type])) {
         require_once 'modules/pmse_Inbox/engine/PMSERelatedModule.php';
         $relatedModule = new PMSERelatedModule();
         $relatedModules = $relatedModule->getRelatedBeans($baseModule, $rel_type);
         $this->relatedModules[$baseModule][$rel_type] = array();
         foreach ($relatedModules['result'] as $module) {
             $this->relatedModules[$baseModule][$rel_type][$module['relationship']] = $module['value'];
         }
     }
     return empty($this->relatedModules[$baseModule][$rel_type][$relationName]) ? null : $this->relatedModules[$baseModule][$rel_type][$relationName];
 }