pos/pos_multiple_control/wizard/wizard_pos_update_statement_balance.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>

     <record id="view_wizard_pos_update_bank_statement_balance_form" model="ir.ui.view">
        <field name="model">wizard.pos.update.bank.statement.balance</field>
        <field name="arch" type="xml">
            <form string="Update Balance">
                Here you can change the <b><field name="balance_moment" readonly="1"/></b>
                <field name="item_ids" nolabel="1">
                    <tree string="Statements" create="0" editable="top" limit="1">
                        <field name="journal_id"/>
                        <field name="balance_moment" invisible="1"/>
                        <field name="balance_start"/>
                        <field name="balance_start_real" invisible="context.get('balance_moment') != 'starting'"/>
                        <field name="total_entry_encoding" invisible="context.get('balance_moment') != 'ending'"/>
                        <field name="balance_end" invisible="context.get('balance_moment') != 'ending'"/>
                        <field name="balance_end_real" invisible="context.get('balance_moment') != 'ending'"/>
                        <field name="currency_id" groups="base.group_multi_currency"/>
                    </tree>
                </field>
                <footer>
                    <button name="action_confirm" string="Apply" type="object" class="btn-primary"/>
                    <button class="btn-secondary" special="cancel" string="Cancel"/>
                </footer>
            </form>
        </field>
    </record>

    <record id="action_wizard_pos_update_bank_statement_balance" model="ir.actions.act_window">
        <field name="name">Update Balances</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">wizard.pos.update.bank.statement.balance</field>
        <field name="view_type">form</field>
        <field name="view_mode">form</field>
        <field name="target">new</field>
    </record>

</odoo>