pos/pos_multiple_control/views/view_pos_session.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (C) 2017 - Today: GRAP (http://www.grap.coop)
@author Sylvain LE GAL (https://twitter.com/legalsylvain)
@author Quentin DUPONT (https://twitter.com/pondupont)
License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
-->

<odoo>

    <record id="view_pos_session_form" model="ir.ui.view">
        <field name="model">pos.session</field>
        <field name="inherit_id" ref="point_of_sale.view_pos_session_form"/>
        <field name="arch" type="xml">
            <!-- Improve views -->
            <field name="config_id" position="attributes">
                <attribute name="readonly">1</attribute>
            </field>

            <!-- Hide obsolete Buttons -->
            <!-- Same name button for opening and closing.. -->
            <xpath expr="//button[@name='open_cashbox']" position="replace">
                <button name="open_cashbox_opening"
                    class="oe_stat_button"
                    attrs="{'invisible':['|', ('cash_control', '=', False), ('state', '!=', 'opening_control')]}"
                    icon="fa-money"
                    type="object" context="{'balance': 'start'}">
                    <span class="o_stat_text">Set Opening Balance</span>
                </button>
            </xpath>
            <!-- Hide closing button -->
            <xpath expr="//button[@name='open_cashbox']" position="replace">
            </xpath>

            <!-- Add new session button on closing-->
            <xpath expr="//header" position="inside">
                <button name="action_pos_session_new_session" type="object" 
                    string="New Session" class="oe_highlight"
                    attrs="{'invisible' : [('state', '!=', 'closed')]}"/>
            </xpath>

            <!-- Theoritical Summary -->
            <xpath expr="//field[@name='cash_register_balance_start']/.." position="attributes">
                <attribute name="invisible">1</attribute>
            </xpath>
            <xpath expr="//field[@name='cash_register_balance_start']/.." position="after">
                <group class="oe_subtotal_footer oe_right">
                    <field name="control_register_balance_start" readonly="1" class="oe_subtotal_footer_separator" widget="monetary" options="{'currency_field': 'currency_id'}"/>
                    <label for="control_register_total_entry_encoding" attrs="{'invisible' : [('state', '=', 'opening_control')]}" string="+ Transactions" class="oe_opening_total"/>
                    <field name="control_register_total_entry_encoding" nolabel="1" attrs="{'invisible' : [('state', '=', 'opening_control')]}" class="oe_pos_total" widget="monetary" options="{'currency_field': 'currency_id'}"/>
                    <label for="control_register_balance_end" attrs="{'invisible' : [('state', '=', 'opening_control')]}" string="Theoretical Closing Balances" class="oe_opening_total"/>
                    <field name="control_register_balance_end" nolabel="1" attrs="{'invisible' : [('state', '=', 'opening_control')]}" class="oe_subtotal_footer_separator" widget="monetary" options="{'currency_field': 'currency_id'}"/>
                </group>
            </xpath>


            <!-- Real Summary and Differences -->
            <xpath expr="//field[@name='cash_register_balance_end_real']/../.." position="replace">
                <div>
                    <group/>
                    <group class="oe_subtotal_footer oe_right" attrs="{'invisible': ['|', ('cash_control', '=', False), ('state', '=', 'opening_control')]}">
                        <field name="control_register_balance" string="Real Closing Balance" class="oe_subtotal_footer_separator" widget="monetary" options="{'currency_field': 'currency_id'}"/>
                        <field name="control_register_difference" class="oe_subtotal_footer_separator oe_right oe_pos_total oe_pos_difference" widget="monetary" options="{'currency_field': 'currency_id'}"/>
                    </group>
                </div>
            </xpath>

            <!--  Summary by Payment Methods -->
            <field name="statement_ids" position="attributes">
                <attribute name="invisible">1</attribute>
            </field>
            <field name="statement_ids" position="after">
                <field name="summary_statement_ids" nolabel="1" colspan="4"
                        attrs="{'invisible': [('state', 'in', ['opening_control'])], 'readonly': 1}">
                    <tree decoration-muted="is_pos_control == False and state != 'closed'" decoration-danger="is_pos_control == True and control_difference != 0">
                        <field name="is_pos_control" invisible="1"/>
                        <field name="name" />
                        <field name="journal_id" />
                        <field name="balance_start"/>
                        <button name="open_cashbox_starting_balance"
                            help="Set your starting balance"
                            type="object"
                            class="oe_stat_button" icon="fa-money"
                            attrs="{'invisible' : ['|', ('is_pos_control','!=', True), ('state', 'in', ['opening_control','closed'])]}">
                        </button>
                        <field name="total_entry_encoding" />
                        <field name="balance_end_real"/>
                        <button name="open_cashbox_ending_balance"
                            help="Set your ending balance"
                            type="object"
                            class="oe_stat_button" icon="fa-money"
                            attrs="{'invisible' : ['|', ('is_pos_control','!=', True), ('state', 'in', ['opening_control', 'closed'])]}">
                        </button>
                        <field name="control_difference"/>
                        <field name="currency_id" groups="base.group_multi_currency" />
                        <field name="state" invisible="1"/>
                    </tree>
                    <form>
                        <group>
                            <field name="name" />
                            <field name="journal_id" />
                            <field name="state" invisible="1" />
                        </group>
                        <field name="line_ids" colspan="2">
                            <tree string="Transactions">
                                <field name="date"/>
                                <field name="ref"/>
                                <field name="name"/>
                                <field name="partner_id" />
                                <field name="amount" sum="Total"/>
                            </tree>
                        </field>
                    </form>
                </field>
            </field>

            <!-- Automatic solve -->
            <field name="control_difference" position="after">
                <field name="pos_session_state" invisible="1"/>
                <field name="display_autosolve" invisible="1"/>
            </field>
            <field name="control_difference" position="after">
                <button name="automatic_solve"
                    help="Solve difference automatically with a product choosen in pos config"
                    type="object"
                    class="oe_stat_button" icon="fa-cogs"
                    confirm="Do you really want to solve this difference automatically ?"
                    attrs="{'invisible':[
                    ('display_autosolve', '!=', True)]}">
                </button>
            </field>
        </field>
    </record>

</odoo>