pos/pos_store_draft_order/view/view.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- ********************************************************************** -->
<!--Point Of Sale - Store Draft Orders Module for Odoo                      -->
<!--Copyright (C) 2015-Today GRAP (http://www.grap.coop)                    -->
<!--@author Sylvain LE GAL (https://twitter.com/legalsylvain)               -->

<!--This program is free software: you can redistribute it and/or modify    -->
<!--it under the terms of the GNU Affero General Public License as          -->
<!--published by the Free Software Foundation, either version 3 of the      -->
<!--License, or (at your option) any later version.                         -->

<!--This program is distributed in the hope that it will be useful,         -->
<!--but WITHOUT ANY WARRANTY; without even the implied warranty of          -->
<!--MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           -->
<!--GNU Affero General Public License for more details.                     -->

<!--You should have received a copy of the GNU Affero General Public License-->
<!--along with this program.  If not, see <http://www.gnu.org/licenses/>.   -->
<!-- ********************************************************************** -->
<openerp>
    <data>

<!-- Model: pos.order -->
        <record id="pos_order_view_form" model="ir.ui.view">
            <field name="model">pos.order</field>
            <field name="inherit_id" ref="point_of_sale.view_pos_order_tree"/>
            <field name="arch" type="xml">
                <field name="state" position="after">
                    <field name="is_partial_paid" invisible="1" />  
                </field>
                <xpath expr="//tree[@string='POS Orders']" position="attributes">
                    <attribute name="colors">red: is_partial_paid==True; blue: state=='draft'; gray: state in ('done','cancel'); black: state not in ('done','cancel')</attribute>
                </xpath>
            </field>
        </record>

<!-- Model: pos.config -->
        <record id="pos_config_view_form" model="ir.ui.view">
            <field name="model">pos.config</field>
            <field name="inherit_id" ref="point_of_sale.view_pos_config_form"/>
            <field name="arch" type="xml">
                <field name="group_by" position="after">
                    <field name="allow_store_draft_order"/>
                </field>
            </field>
        </record>

    </data>
</openerp>