I'm converting one of my custom module from Odoo 12 to 13, during the conversion the given log is repeating all the time. 

 File "/home/nizar/workspace/odoo/odoo/addons/base/models/ir_ui_view.py", line 406, in _check_xml raise ValidationError(_('Invalid view %s definition in %s') % (view_name, view.arch_fs

odoo.tools.convert.ParseError: "Invalid view portal.client.select definition in portal/views/portal.xml

My view definition:

<record id="view_portal_client_filter" model="ir.ui.view">
    <field name="name">portal.client.select</field>
    <field name="model">client</field>
    <field name="arch" type="xml">
        <search string="Search Client">
            <field name="name" string="Database Name"/>
            <filter string="In Progress" name="current" domain="[('state', '=','open')]"/>
            <separator/>
            <field name="partner_id" string="Contact" filter_domain="[('partner_id', 'child_of', self)]"/>
            <group expand="0" string="Group By">
                <filter string="Plan" domain="[]" context="{'group_by':'plan_id'}"/>
            </group>
        </search>
    </field>
</record>