Ok, I am following your advice. Can you point me in the right direction on how to pass the proposal id in the post object filter code? I am trying to figure out where to look..
Thank a lot!
function assign_proposal_to_review( $args, $field, $post_id ) {
// only show children of the current post being edited
$args['page_id'] = '???';
// return
return $args;
}
add_filter('acf/fields/post_object/query/name=proposal_reviewed', 'assign_proposal_to_review', 10, 3);