eiru_quota_analysis/views/account_invoice_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
	<data>
        <record id="account_invoice_quota_view" model="ir.ui.view">
            <field name="name">account.invoice.quota.view</field>
            <field name="model">account.invoice</field>
            <field name="inherit_id" ref="account.invoice_form"/>
            <field name="arch" type="xml">
				<xpath expr="//notebook/page[@string='Payments']" position="after">
                    <page string="Cuotas" groups="base.group_user" attrs="{'invisible': [('state','not in',('open'))]}">
						<div class="quota_box"></div>
                    </page>
				</xpath>
            </field>
        </record>
	</data>
</openerp>