flectra/addons/l10n_ch/views/account_invoice_view.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra>
    <data>
        <record id="isr_invoice_form" model="ir.ui.view">
            <field name="name">l10n_ch.account.invoice.form</field>
            <field name="model">account.invoice</field>
            <field name="inherit_id" ref="account.invoice_form"/>
            <field name="arch" type="xml">
                <xpath expr="//field[@name='partner_bank_id']" position="attributes">
                    <attribute name="invisible">0</attribute>
                </xpath>

                <xpath expr="//field[@name='sent']" position="after">
                    <field name="l10n_ch_isr_sent" invisible="1"/>
                    <field name="l10n_ch_currency_name" invisible="1"/>
                </xpath>

                <xpath expr="//button[@id='account_invoice_payment_btn']" position="before">
                    <button id="l10n_ch_btn_isr_print_highlight"
                        name="isr_print"
                        string="Print ISR"
                        type="object"
                        attrs="{'invisible':['|', ('l10n_ch_isr_sent', '=', True),
                                                '|', ('state', '!=', 'open'),
                                                    ('l10n_ch_currency_name', 'not in', ['EUR', 'CHF'])]}"
                        class="oe_highlight"
                        groups="base.group_user"
                        />
                </xpath>

                <xpath expr="//button[@id='account_invoice_payment_btn']" position="before">
                    <button id="btn_isr_print_normal"
                        name="isr_print"
                        string="Print ISR"
                        type="object"
                        attrs="{'invisible':['|', ('l10n_ch_isr_sent', '=', False),
                                                '|', ('state', '!=', 'open'),
                                                    ('l10n_ch_currency_name', 'not in', ['EUR', 'CHF'])]}"
                        groups="base.group_user"
                        />
                </xpath>
            </field>
        </record>

        <record id="isr_invoice_search_view" model="ir.ui.view">
            <field name="name">l10n_ch.invoice.select</field>
            <field name="model">account.invoice</field>
            <field name="inherit_id" ref="account.view_account_invoice_filter"/>
            <field name="mode">primary</field>
            <field name="arch" type="xml">
                <xpath expr="//search" position="inside">
                    <field name="l10n_ch_isr_number" string="ISR reference number"/>
                </xpath>
            </field>
        </record>

        <!--Overridden action (and primary child view), so the filter are only
        available for customer invoices-->
        <record id="account.action_invoice_tree1" model="ir.actions.act_window">
            <field name="name">Customer Invoices</field>
            <field name="res_model">account.invoice</field>
            <field name="search_view_id" ref="isr_invoice_search_view"/>
        </record>
    </data>
</flectra>