partner_print_budget/service_siniestro_fields_view.xml

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

        <record id="view_service_siniestro_form" model="ir.ui.view">
            <field name="name">service_siniestro.inherit</field>
            <field name="model">project.service.task</field>
            <field name="inherit_id" ref="eiru_service.project_service_task_form"/>
            <field name="arch" type="xml">
            <xpath expr="//notebook" position="before">
            <page string="Datos de Siniestro">
                <group string="Siniestro">

                        <field name="nro_siniestro"/>


            </field>
            </xpath>
        </record>


    </data>
</openerp>