function cleanDBonPurge()
{
global $DB;
$pt = new ProjectTask();
$pt->cleanDBonItemDelete(__CLASS__, $this->fields['id']);
$cp = new Change_Project();
$cp->cleanDBonItemDelete(__CLASS__, $this->fields['id']);
$ip = new Item_Project();
$ip->cleanDBonItemDelete(__CLASS__, $this->fields['id']);
$pt = new ProjectTeam();
$pt->cleanDBonItemDelete(__CLASS__, $this->fields['id']);
parent::cleanDBonPurge();
}