I inherited the view "view_order_tree" to modify the title "Sales Orders" to "Bills" but it does not work. Though overriding other fields work. OpenERP 7.0.

        <record id="view_order_tree_with_title_bills" model="ir.ui.view">

            <field name="name">sale.order.tree</field>

            <field name="model">sale.order</field>

            <field name="inherit_id" ref="sale.view_order_tree"/>

            <field name="priority">2</field>

            <field name="arch" type="xml">

                <xpath expr="//tree[@string='Sales Orders']" position="attributes">

                    <attribute name="string">Bills</attribute>

                </xpath>

                ......