public function setWarehouseId( $warehouseid )
	{
		if ( $warehouseid === $this->getWarehouseId() ) { return; }

		if ( $warehouseid !== null ) {
			$warehouseid = (int) $warehouseid;
		}

		$this->_values['warehouseid'] = $warehouseid;
		$this->setModified();
	}