John Huebner

I just pushed an update that should correct the issue.

function cf7_dynamic_select() {
	$output = array();
	$args = array(
		'post_type' => 'page',
		'post_parent' => '1331',
		'order'=> 'ASC',
		'orderby'=> 'menu_order',
		'hide_empty' => 0 );

	$the_query = new WP_Query( $args );

	while ( $the_query->have_posts() ) :
		$the_query->the_post();
		$output[get_the_title()] = get_the_title();
	endwhile;

	// add another item at end
	$output['altro'] = 'altro';

	return $output;
}
add_filter('my-filter', 'cf7_dynamic_select', 10, 2);

Yes

$choices = array('-- Make a Selection --' => '');
$choices = array_merge($choices, array_flip(get_field('prod_esecuzione')));

After re-reading your op and then reading the second, I think I might be a little lost. If the field is on just posts then it will work, but that’s the only case. Also, this plugin only works with ACF5, which is currently only available in premium and will not work with ACF4. I just tested, just to make sure, and it is working.

You might want to give a look at how this plugin works as well as the ACF documentation on doing a similar thing. It would be possible to create a two way relationship between a taxonomy field and a relationship field or a post object field or a user field. It’s just that it would need to be coded for the specific fields that your interested in creating the two way relationship for.

That is something that would need to be done with AJAX and is beyond the capabilities of this plugin.

k, I uploaded a new version to the WP repo. Please let me know if there are any other problems.