Не понятки со сложной логикой в фильтре, в методе CSocNetMessages::GetList()

if(CModule::IncludeModule("socialnetwork") && CModule::IncludeModule("iblock")){  
   global $USER;
   $resMess = CSocNetMessages::GetList(
           array("DATE_CREATE" => "DESC",),
      array(
         "MESSAGE_TYPE" => "P",
         array(
            "LOGIC" => "OR",
            array(
               "FROM_USER_ID" => $USER->GetID(), 
               "FROM_DELETED" => "N"
            ),
            array(
               "TO_USER_ID" => $USER->GetID(),
               "TO_DELETED" => "N"
            ),
         ),
      ),
      false,
      false,
      array('*')
   );
   while($obMes = $resMess->Fetch()){
      echo '<pre>';
      print_r($obMes);
      echo '</pre>';
   }   
}