pos/pos_change_payment/view/view.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- ********************************************************************** -->
<!--Point Of Sale - Change Payment 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="view_pos_order_form" model="ir.ui.view">
        <field name="model">pos.order</field>
        <field name="inherit_id" ref="point_of_sale.view_pos_pos_form" />
        <field name="arch" type="xml">
            <button string="Payment" position="attributes">
                <attribute name="context">{'pos_session_id' : session_id}</attribute>
            </button>
            <button name="refund" position="before">
                <button name="%(action_pos_change_payments_wizard)d"
                    context="{'pos_session_id' : session_id}"
                    string="Change Payments" type="action" states="paid,invoiced"/>
            </button>

            <field name="journal_id" position="after">
                <button name="%(action_pos_switch_journal_wizard)d" string="Switch Journal"
                    type="action" icon="gtk-index"/>
            </field>
        </field>
    </record>

<!-- Model: account.bank.statement -->
    <record id="view_account_bank_statement_form" model="ir.ui.view">
        <field name="model">account.bank.statement</field>
        <field name="inherit_id" ref="account.view_bank_statement_form" />
        <field name="arch" type="xml">
            <xpath expr="//field[@name='line_ids']/tree/field[@name='amount']" position="after">
                <field name="pos_statement_id" invisible="1" />
                <button name="%(action_pos_switch_journal_wizard)d" string="Switch Journal" type="action" icon="gtk-index" attrs="{'invisible':[('pos_statement_id', '=', False)]}"/>
            </xpath>
        </field>
    </record>

<!-- Model: pos.switch.journal.wizard-->
        <record id="view_pos_switch_journal_wizard_form" model="ir.ui.view">
            <field name="model">pos.switch.journal.wizard</field>
            <field name="arch" type="xml">
                <form string="Switch Journal">
                    <group col="4">
                        <field name="statement_line_id" />
                        <field name="old_journal_id" />
                        <field name="new_journal_id" />
                        <field name="available_journal_ids" />
                        <field name="new_statement_id" />
                        
                        <field name="amount" />
                    </group>
                    <footer>
                        <button name="button_switch_journal" string="Switch Journal" type="object" class="oe_highlight"/>
                        <label string="or" />
                        <button string="Cancel" class="oe_link" special="cancel" />
                    </footer>
                </form>
            </field>
        </record>

<!-- Model: pos.switch.journal.wizard-->
        <record id="view_pos_change_payments_wizard_form" model="ir.ui.view">
            <field name="model">pos.change.payments.wizard</field>
            <field name="arch" type="xml">
                <form string="Change Payments" version="7.0">
                    <group col="4">
                        <field name="order_id" />
                        <field name="amount_total" />
                        <field name="line_ids" colspan="4">
                            <tree string="Payment Lines" editable="bottom">
                                <field name="journal_id" />
                                <field name="amount" />
                            </tree>
                        </field>
                    </group>
                    <footer>
                        <button name="button_change_payments" string="Change Payments" type="object" class="oe_highlight"/>
                        <label string="or" />
                        <button string="Cancel" class="oe_link" special="cancel" />
                    </footer>
                </form>
            </field>
        </record>

    </data>
</openerp>