pos_restaurant_table_management/views/pos_order_views.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright <YEAR(S)> <AUTHOR(S)>
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl). -->

<openerp>
    <data>

        <record id="pos_order_view_form" model="ir.ui.view">
            <field name="name">Inherit : Order Tables Form</field>
            <field name="model">pos.order</field>
            <field name="inherit_id" ref="point_of_sale.view_pos_pos_form"/>
            <field name="arch" type="xml">
                <xpath expr="//field[@name='partner_id']" position="after">
                    <field name="table_id" string="Mesa"/>
                </xpath>
            </field>
        </record>

        <record id="pos_order_view_tree" model="ir.ui.view">
            <field name="name">Inherit : Order Tables Tree</field>
            <field name="model">pos.order</field>
            <field name="inherit_id" ref="point_of_sale.view_pos_order_tree"/>
            <field name="arch" type="xml">
                <xpath expr="//field[@name='partner_id']" position="after">
                    <field name="table_id" string="Mesa"/>
                </xpath>
            </field>
        </record>

    </data>
</openerp>