/**
* Remove the portfolio template from the parent theme/plugin functions.
*/
add_action( 'init', 'remove_abcd_item_template', 20 );
function remove_greennature_portfolio_template() {
// Remove the filter that modifies the single template.
remove_filter( 'single_template', 'remove_abcd_item_template' );
}
had to copy the single item template in child theme root directory, replaced the method with my own custom method