$this_cpt_id = get_the_id();
$test = new WP_Query(array('showposts' => 20, 'post_parent' => $this_cpt_id, 'orderby' => 'menu_order' , 'post_type' => 'solutions' , 'order'   => 'ASC'));
if ( $test->have_posts() ) :
while ($test->have_posts()) :
$test->the_post();
echo '<a class="white-box" href="';
echo the_permalink();
echo '">';
echo the_title();
echo '</a>';
endwhile; endif;