Ticket #15665: post.diff

wp-includes/post.php

@@ -51 +51 @@
                 '_edit_link' => 'media.php?attachment_id=%d', /* internal use only. don't use this when registering your own post type. */
                 'capability_type' => 'post',
                 'map_meta_cap' => true,
-                'hierarchical' => false,
+                'hierarchical' => true,
                 'rewrite' => false,
                 'query_var' => false,
                 'show_in_nav_menus' => false,