Extension talk:Hierarchy/Hierarchy.php

If somebody has some issues about displaying subordinate pages in the navigation box, this code might help you out.

In the file Hierarchy.php, replace this code

$parent_id[$toclevel] = $current_article_id;
if ($toclevel > $max_level) $max_level = $toclevel;
for ($i = $toclevel + 1; $i <= $max_level; $i++) {
    $parent_id[$i] = 0;  // clear lower levels to prevent using an old value in case some intermediary levels are omitted
}
$parentArticleId = $parent_id[$toclevel - 1];
$parentArticleId = intval($parentArticleId);

By this one

$parent_id[$TOC_number] = $current_article_id;
if(strlen($TOC_number)==1)
     $parentArticleId = $root_article_id;
else{
    $previoustoc = substr($TOC_number, 0, strlen($TOC_number)-2);
    $parentArticleId = $parent_id[$previoustoc];
}