Preparation

1. Add 1-2 products with prices into Products section. Enable them - you should see them on website.
2. Open the themes/advanced/in-commerce/checkout/shop_cart.tpl template for editing:
3. Locate <inp2:ord_PrintCart ... line
4. Add this code after it:

<inp2:m_DefineElement name="test_element">
    <inp2:Field name="Name"/>
</inp2:m_DefineElement>

<inp2:p_PrintList render_as="test_element" per_page="2"/><br/>

5. Save changes
6. Go to products list page and add some product into shopping cart
7. you should get error in debugger:

Testing

1. Apply patch
2. Reload shopping cart page - error should be gone