smarticon_pos/res_partner_view.xml

<?xml version="1.0"?>
<openerp>
    <data>

        <record id="act_res_partner_2_pos_order" model="ir.actions.act_window">
            <field name="name">Pos</field>
            <field name="res_model">pos.order</field>
            <field name="view_mode">tree,form</field>
            <field name="context">{'search_default_partner_id': active_id}</field>
            <field name="view_id" eval="False"/>
            <field name="search_view_id" ref="point_of_sale.view_pos_order_filter"/>
        </record>

        <!-- Partner kanban view inherte -->
         <record model="ir.ui.view" id="point_sale_partner_kanban_view">
             <field name="name">point.sale.kanban.saleorder.inherit</field>
             <field name="model">res.partner</field>
             <field name="inherit_id" ref="base.res_partner_kanban_view"/>
             <field name="priority" eval="20"/>
             <field name="arch" type="xml">
                   <field name="mobile" position="after">
                       <field name="pos_order_count"/>
                   </field>
                   <xpath expr="//div[@class='oe_kanban_partner_links']" position="inside">
                       <a name="%(smarticon_pos.act_res_partner_2_pos_order)d" type="action" t-if="record.pos_order_count.value>0">
                           <t t-esc="record.pos_order_count.value"/> Pos
                       </a>
                   </xpath>
               </field>
         </record>

        <!--  Partners inherited form -->
        <record model="ir.ui.view" id="view_pos_partner_info_form">
            <field name="name">res.partner.pos.buttons</field>
            <field name="model">res.partner</field>
            <field name="inherit_id" ref="base.view_partner_form"/>
            <field name="priority" eval="50"/>
            <field name="arch" type="xml">
                <xpath expr="//div[@name='buttons']" position="inside">
                    <button
                        class="oe_inline oe_stat_button"
                        type="action"
                        name="%(smarticon_pos.act_res_partner_2_pos_order)d"
                        attrs="{'invisible': [('customer', '=', False)]}"
                        icon="fa-strikethrough"
                        context="{'search_default_partner_id': active_id}">
                        <field string="Pos" name="pos_order_count" widget="statinfo"/>
                    </button>
                </xpath>
            </field>
       </record>

    </data>
</openerp>