• John Huebner

• August 14, 2015 at 3:07 am

Have you tried something like

// relationship field "Fächer"
	// the key of the field "Fächer"
	add_filter('acf/fields/relationship/query/key=field_5593ec53f0a0c', 'my_relationship_query', 10, 3);
	function my_relationship_query( $args, $field, $post )
	{
	    // show only pages with this special template
	    $args['meta_key'] = '_wp_page_template';
	    $args['meta_value'] = 'page-fach.php';
	    return $args;
	}