Multisite child page url doesn't work

[nexuspolaris]

Hello!

I build a website with two different domains connected to the website by Multisite modul. This is my config.php multisite settings:

<?php
$config->MultisiteDomains = array(
  "dev.regiosite.com" => array(
          "root" => "regiosite",
          "http404" => 27
      ),
  "dev.origisite.com" => array(
          "root" => "origisite",
          "http404" => 27
      )
);
?>

This is the page structure:

Web (web.regiosite.com)
-Regiosite (dev.regiosite.com)
--About us
--404
-Origosite (dev.origosite.com)
--About us
--404

The navigation loop:

<?php
$siteRoot = $page->rootParent;

 foreach ($siteRoot->children as $child) {
	echo "<li><a href='$child->url'>$child->title</a></li>";
 }
?>

When I click on the child page's name (About us) in the menu the url is right in the browser (http://dev.regiosite.com/about-us) but doesn't load the child page's content.

This way works: http://web.regiosite.com/regiosite/about-us

What am I missing? Or I need to change something in the .htaccess?