account_invoice_view.xml

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

<!--
    Copyright (C) 2013 Akretion (http://www.akretion.com/)
    @author Alexis de Lattre <alexis.delattre@akretion.com>
    The licence is in the file __openerp__.py
-->

<openerp>
<data>


<record id="invoice_form" model="ir.ui.view">
    <field name="name">prepaid.cutoff.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='invoice_line']/tree/field[@name='account_analytic_id']" position="after">
            <field name="start_date" />
            <field name="end_date" />
        </xpath>
        <!-- Code to test the form view of invoice lines -->
        <!--
        <xpath expr="//field[@name='invoice_line']/tree" position="attributes">
            <attribute name="editable"></attribute>
        </xpath>  -->
    </field>
</record>


<record id="invoice_supplier_form" model="ir.ui.view">
    <field name="name">prepaid.cutoff.invoice_supplier_form</field>
    <field name="model">account.invoice</field>
    <field name="inherit_id" ref="account.invoice_supplier_form" />
    <field name="arch" type="xml">
        <xpath expr="//field[@name='invoice_line']/tree/field[@name='account_analytic_id']" position="after">
            <field name="start_date" />
            <field name="end_date" />
        </xpath>
    </field>
</record>


<record id="view_invoice_line_form" model="ir.ui.view">
    <field name="name">prepaid.cutoff.invoice_line_form</field>
    <field name="model">account.invoice.line</field>
    <field name="inherit_id" ref="account.view_invoice_line_form"/>
    <field name="arch" type="xml">
        <xpath expr="//field[@name='discount']/.." position="after">
            <group name="start_end_dates">
                <field name="start_date" />
                <field name="end_date" />
            </group>
        </xpath>
    </field>
</record>


</data>
</openerp>