contract/contract_price_revision/wizards/create_revision_line_views.xml

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

    <record id="contract_line_duplicate_wizard_view" model="ir.ui.view">
        <field name="name">Create Revision Line</field>
        <field name="model">create.revision.line.wizard</field>
        <field name="arch" type="xml">
            <form>
                <div>
                    Set new start date and variation percent to duplicate.
                    This process set start date previous day as end date of
                    origin record.
                    <br/>
                    <br/>
                </div>
                <group>
                    <group>
                        <field name="date_start"/>
                        <field name="date_end"/>
                        <field name="variation_percent"/>
                    </group>
                </group>
                <footer>
                    <button string="Apply" name="action_apply"
                            type="object" class="oe_highlight"/>
                    or
                    <button string="Cancel" class="oe_link" special="cancel"/>
                </footer>
            </form>
        </field>
    </record>

    <act_window id="contract_line_duplicate_wizard_action"
        name="Create revision of contract lines"
        src_model="account.analytic.account"
        res_model="create.revision.line.wizard"
        view_type="form" view_mode="form"
        key2="client_action_multi" target="new"
    />

</odoo>