web/web_x2m_defaults_from_previous/demo/ir_ui_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record id="view_groups_form" model="ir.ui.view">
            <field name="model">res.groups</field>
            <field name="inherit_id" ref="base.view_groups_form" />
            <field name="arch" type="xml">
                <field name="model_access" position="attributes">
                    <attribute name="options">{'web_x2m_defaults_from_previous': ['model_id', 'name']}</attribute>
                </field>
            </field>
        </record>
    </data>
</openerp>