Re-route template for hierarchical custom post types

hierarchical_cpt_template.php

<?php

add_filter( 'page_template', 'pilau_hierarchical_cpt_template' );
/**
 * Re-route template for hierarchical custom post types
 *
 * Not sure why this is needed????
 *
 * @param	string	$template
 * @return	string
 */
function pilau_hierarchical_cpt_template( $template ) {
	if ( get_post_type() != 'page' ) {
		$template = trailingslashit( get_stylesheet_directory() ) . 'single-' . get_post_type() . '.php';
	}
	return $template;
}