public function startImport()
    {
        if ($this->_targetModel instanceof \MUtil_Model_ModelAbstract) {
            // No multiOptions as a new items can be created during import
            $fields = array(
                'gap_id_attended_by', 'gap_id_referred_by', 'gap_id_activity',  'gap_id_procedure', 'gap_id_location',
                );
            foreach ($fields as $name) {
                $this->_targetModel->del($name, 'multiOptions');
            }
        }

        return parent::startImport();
    }