function cleanDBonPurge()
{
$class = new Contract_Supplier();
$class->cleanDBonItemDelete($this->getType(), $this->fields['id']);
$class = new ContractCost();
$class->cleanDBonItemDelete($this->getType(), $this->fields['id']);
$class = new Contract_Item();
$class->cleanDBonItemDelete($this->getType(), $this->fields['id']);
$class = new Alert();
$class->cleanDBonItemDelete($this->getType(), $this->fields['id']);
}