docs: public String getTransactionId()
    {
      String tranID = null;
      try
      {
        PersistentTranId pTranID = getSIMPMessage().getTransactionId();
        
        if (pTranID != null)
        {
          tranID = pTranID.toTMString(); 
        }
      }
      catch (SIResourceException e)
      {
        // No FFDC code needed  
        SibTr.exception(tc, e);
      }      
  
      return tranID;
    }