flectra/addons/mrp_repair/wizard/mrp_repair_make_invoice_views.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra>
    <data>
        
        <!--  Make Invoice -->
        
        <record id="view_make_invoice" model="ir.ui.view">
            <field name="name">Make Invoice</field>
            <field name="model">mrp.repair.make_invoice</field>
            <field name="arch" type="xml">
            <form string="Create invoices">
                <group string="Do you really want to create the invoice(s)?">
                    <field name="group"/>
                </group>
                <footer>
                    <button name="make_invoices" string="Create Invoice" type="object" class="btn-primary"/>
                    <button string="Cancel" class="btn-default" special="cancel" />
                </footer>
            </form>
            </field>
        </record>

        <act_window name="Create Invoice"            
            res_model="mrp.repair.make_invoice"
            src_model="mrp.repair"
            view_mode="form"
            target="new"        
            key2="client_action_multi"    
            id="act_mrp_repair_invoice"
            multi="True"/>        
        
    </data>
</flectra>