FHC-Core/application/models/system/Recipient_model.php

<?php
class Recipient_model extends DB_Model
{

	/**
	 * Constructor
	 */
	public function __construct()
	{
		parent::__construct();
		$this->dbTable = 'public.tbl_msg_recipient';
		$this->pk = array('person_id', 'message_id');
		$this->hasSequence = false;
	}
}