microdata ERROR: Why is it impossible to determine the ownership of these fields?

Question

HTML

For seo snippets on the site, I place micro-markup by adding to the lines

<title>заголовок сайта</title>
...
<div id="wrapper">
...

following content

<title itemprop="headline">заголовок сайта</title>
...
<div id="wrapper" itemscope itemtype="http://schema.org/WPHeader">
...

to which in Yandex webmaster I get the following error:

microdata ERROR: Unable to determine ownership of these fields. There are two possible reasons: these fields are placed incorrectly, or an extra itemprop attribute is specified itemType = headline = site header wpheader itemType = schema.org/WPHeader

how to fill in the fields correctly?

Answer 1

Itemprop must be inside itemscope

<div itemscope itemtype="http://schema.org/WPHeader">
    <div itemprop="headline">заголовок сайта</div>
</div>