Magento : How to convert quote item attribute to order item attribute

Question

I've added a quote item attribute and an order item attribute (and invoice and shipment) called "parent_info":

$installer->addAttribute("quote_item", "parent_info", array("type"=>"varchar"));
$installer->addAttribute("order_item", "parent_info", array("type"=>"varchar"));
$installer->addAttribute("invoice_item", "parent_info", array("type"=>"varchar"));
$installer->addAttribute("shipment_item", "parent_info", array("type"=>"varchar"));

I was able to save the user input to the quote item, but I can't convert it to the order item. I've tried to add this code under global in my config file:

    <fieldsets>
        <sales_convert_quote_item>
            <parent_info>
                <to_order_item>*</to_order_item>
                <to_invoice_item>*</to_invoice_item>
                <to_shipment_item>*</to_shipment_item>
            </parent_info>
        </sales_convert_quote_item>
    </fieldsets>

but when I moved to checkout nothing happened

I've also tried to add an observer:

<sales_convert_quote_item_to_order_item>
            <observers>
                <extra_options>
                    <type>model</type>
                    <class>test/observer</class>
                    <method>onSalesConvertQuoteItemToOrderItem</method>
                </extra_options>
            </observers>
        </sales_convert_quote_item_to_order_item>

But it doesn't get called (I've added a log to the observer method).

What can be the problem? Can it be because I use an extension for the checkout (gomage lightcheckout)?