I have the relationship field set to use the Post ID.
Here’s my code where I need the variable “$theids” at line 8 to output the post id’s:
<?php
$theids = get_field(post_id_one);
$latest_title = get_field(latestposts_title);
if( get_field('show_posts') )
{
echo '<div class="container"><div class="acsc-outer">
<div class="fancyheader"><span class="acsc-title">' . $latest_title . '</span></div>
</div>' . do_shortcode( '[display-posts include_excerpt="true" id="'.$theids.'"]' ) . '</div>';
}
?>