Hi Keith,
I tried it again and it doesn’t work for a post_object field that does not allow multiple values.
If you look at the code you can see that it’s looking for an array value:
// loop over selected posts and add this $post_id
if( is_array($value) ) {
foreach( $value as $post_id2 ) {
I would certainly like to use the ‘native’ solution if there is a way to get it to work with single values.