Yep it seems to works. Here is it what I did based on your solution:
<?php
$post_ids = get_field(' my_custom_field', false, false);
$posts = get_posts(array(
'post_type' => 'post',
'orderby' => 'post_date',
'posts_per_page' => -1,
'post__in' => $post_ids,
));
if( $posts ) {
?>
<ul>
<?php foreach( $posts as $post): ?>
<?php setup_postdata($post); ?>
<li class="line">
<a title="<?php the_title_attribute(); ?>" href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
<?php the_excerpt(); ?>
</li>
<?php endforeach; ?>
</ul>
<?php } ?>
Any advice are welcome. 😉
