"position" property required for ItemList with Product list items?

Question

I have a problem: Google’s Structured Data Testing Tool gives me an error:

Tag position doesn't exist. It's required.

I add it to the markup. Than I get this error:

Position property is not valid for an object of type Product

Here is my markup:

<table id="sale_table" itemscope="" itemtype="http://schema.org/ItemList">
    <tbody>
            <tr itemprop="itemListElement" itemscope="" itemtype="http://schema.org/Product">
                <td class="sale_art_td" itemprop="productID">10496278</td>
                <td class="sale_brand_td" itemprop="brand"><span itemprop="name ">--</span></td>
                <td class="sale_name_td" itemprop="name">10496278 / Крышка трамблера Daewoo Nexia,Espero DD</td>
                <td class="sale_am_td">1.00</td>
                <td class="sale_price_td" itemprop="offers" itemscope="" itemtype="http://schema.org/Offer"><meta itemprop="priceCurrency" content="RUR"><span itemprop="price">341.50</span></td>
                <td class="sale_buy_td"><a href="javascript:void(0);" class="sale_buy_link" data-id="63455914" data-query="10496278">Купить</a><!--<img src="/upload/badge/sale_cart.png" />--></td>
                <td class="hidden">
                    <meta itemprop="url" content="/partsearch/?q=10496278">
                                        <span itemprop="description">Распродажа: 10496278 / Крышка трамблера Daewoo Nexia,Espero DD по цене 341.50</span>
                </td>
            </tr>
                    <tr itemprop="itemListElement" itemscope="" itemtype="http://schema.org/Product">
                <td class="sale_art_td" itemprop="productID">76202sx0a12</td>
                <td class="sale_brand_td" itemprop="brand"><span itemprop="name ">HONDA</span></td>
                <td class="sale_name_td" itemprop="name">76202SX0A12</td>
                <td class="sale_am_td">1.00</td>
                <td class="sale_price_td" itemprop="offers" itemscope="" itemtype="http://schema.org/Offer"><meta itemprop="priceCurrency" content="RUR"><span itemprop="price">704.00</span></td>
                <td class="sale_buy_td"><a href="javascript:void(0);" class="sale_buy_link" data-id="63456060" data-query="76202sx0a12">Купить</a><!--<img src="/upload/badge/sale_cart.png" />--></td>
                <td class="hidden">
                    <meta itemprop="url" content="/partsearch/?q=76202sx0a12">
                                        <span itemprop="description">Распродажа: 76202SX0A12 по цене 704.00</span>
                </td>
            </tr>
    </tbody>
 </table> 

Answer 1

This is not an error with your code. It just means that Google won’t display a certain Rich Snippet (or a similar feature) unless you provide this property.

However, the position property is not defined for the Product type, so this does not make any sense.

It seems that this is a new structured data feature from Google, which is not documented yet, as it links to a 404 page: List Page Carousels. Maybe it’s a work in progress and they didn’t mean to publish the check in their Testing Tool yet.

So I’d simply ignore this for now.