<?xml version="1.0"?>
<data><field name="invoice_date" position="attributes">
                <attribute name="optional">hide</attribute>
            </field>
            <field name="date" position="attributes">
                <attribute name="optional">show</attribute>
            </field>
            <field name="matching_number" position="attributes">
                <attribute name="optional">show</attribute>
            </field>
            <field name="partner_id" position="attributes">
                <attribute name="optional">show</attribute>
            </field>
        </data>