/**
  * Resends the TAT invitation email to the reference subject.
  *
  * @param string $enquiryId
  * Identifies the reference. Can be either the IRN or the ERN.
  *
  * @return boolean
  * Returns true on success, false otherwise.
  */
 public function resendTatInvitation($enquiryId)
 {
     $returnVal = false;
     $tatManager = new Manager_Referencing_Tat($enquiryId);
     if ($tatManager->isTatApplicable()) {
         //Does not check if initial invitation has been sent.
         $tatMailManager = new Manager_Referencing_TatMail($tatManager->_reference);
         if ($tatMailManager->sendTatInvitation()) {
             $returnVal = true;
         }
     }
     return $returnVal;
 }