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I'm trying to create a new product with API URL, but I cannot get any error and any new product created. why?

this is my xml

<prestashop xmlns:xlink="http://www.w3.org/1999/xlink">
    <product>
        <id_shop_default>1</id_shop_default>
        <name>
            <language id="1">CIRO PROVA</language>
        </name>
        <price>9.80</price>
        <reference>A-10273</reference>
        <description>CIRO PROVA</description>
        <active>1</active>
        <advanced_stock_management>1</advanced_stock_management>
        <id_tax_rules_group>1</id_tax_rules_group>
        <width>0.000000</width>
        <height>0.000000</height>
        <depth>0.000000</depth>
        <weight>0.000000</weight>
        <on_sale>0</on_sale>
        <online_only>0</online_only>
        <minimal_quantity>0</minimal_quantity>
        <customizable>0</customizable>
        <text_fields>0</text_fields>
        <uploadable_files>0</uploadable_files>
        <available_for_order>1</available_for_order>
        <condition>new</condition>
        <show_price>1</show_price>
        <date_add>2016-08-10</date_add>
        <associations>
            <categories>
                <id>2</id>
            </categories>
        </associations>
        <link_rewrite>
            <language id="1">ciroprova</language>
        </link_rewrite>
    </product>
</prestashop>