odoo/addons/portal_sale/portal_sale_view.xml

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

        <!--
            Override the original action to set another help field and/or
            another context field, more suited for portal members
        -->
        <record id="action_order_tree5" model="ir.actions.act_window">
            <field name="name">Quotations</field>
            <field name="type">ir.actions.act_window</field>
            <field name="res_model">sale.order</field>
            <field name="view_mode">tree,form,calendar,graph</field>
            <field name="context">{"search_default_draft":1}</field>
            <field name="search_view_id" ref="sale.view_sales_order_filter"/>
            <field name="help">We haven't sent you any quotation.</field>
        </record>

        <record id="action_order_form" model="ir.actions.act_window">
            <field name="name">Sales Orders</field>
            <field name="type">ir.actions.act_window</field>
            <field name="res_model">sale.order</field>
            <field name="view_mode">tree,form,calendar,graph</field>
            <field name="search_view_id" ref="sale.view_sales_order_filter"/>
            <field name="context">{"search_default_sales":1}</field>
            <field name="help">We haven't sent you any sale order.</field>
        </record>

        <record id="action_invoice_tree1" model="ir.actions.act_window">
            <field name="name">Customer Invoices</field>
            <field name="res_model">account.invoice</field>
            <field name="view_mode">tree,form,calendar,graph</field>
            <field name="domain">[('type','=','out_invoice')]</field>
            <field name="context">{'type':'out_invoice', 'journal_type': 'sale'}</field>
            <field name="search_view_id" ref="account.view_account_invoice_filter"/>
            <field name="help">We haven't sent you any invoice.</field>
        </record>

        <record id="action_vendor_receipt" model="ir.actions.act_window">
            <field name="name">Customer Refunds</field>
            <field name="res_model">account.invoice</field>
            <field name="domain">[('type','=','out_refund')]</field>
            <field name="context">{'type':'out_refund'}</field>
            <field name="search_view_id" ref="account.view_account_invoice_filter"/>
            <field name="help">We haven't sent you any refund.</field>
        </record>

        <menuitem name="Quotations" id="portal_quotations" parent="portal.portal_orders"
            action="action_order_tree5" sequence="10"/>
        <menuitem name="Sales Orders" id="portal_sales_orders" parent="portal.portal_orders"
            action="action_order_form" sequence="20"/>
        <menuitem name="Invoices" id="portal_invoices" parent="portal.portal_orders"
            action="action_invoice_tree1" sequence="30"/>
        <menuitem name="Customer Refunds" id="portal_payments" parent="portal.portal_orders"
            action="action_vendor_receipt" sequence="40"/>

    </data>
</openerp>