contract/contract_show_recurring_invoice/views/contract_view.xml

<?xml version="1.0"?>
<openerp>
    <data>

        <record id="act_recurring_invoices" model="ir.actions.act_window">
            <field name="context">{'search_default_contract_id':
                [active_id],
                'default_contract_id': active_id}
            </field>
            <field name="name">Invoices</field>
            <field name="res_model">account.invoice</field>
            <field name="view_id" ref="account.invoice_tree" />
            <field name="search_view_id" ref="account.view_account_invoice_filter" />
        </record>

        <record id="account_analytic_account_button_recurring_invoice"
            model="ir.ui.view">
            <field name="name">account.analytic.account.button.invoice
            </field>
            <field name="model">account.analytic.account</field>
            <field name="inherit_id" ref="account_analytic_analysis.account_analytic_account_form_form" />
            <field name="arch" type="xml">
                <button name="recurring_create_invoice" position="after">
                    <button attrs="{'invisible': [('recurring_invoices','!=',True)]}"
                        name="%(contract_show_recurring_invoice.act_recurring_invoices)d"
                        string="⇒ show invoices" class="oe_link" type="action"/>
                </button>
            </field>
        </record>

    </data>
</openerp>