workorder_printbioelectric/views/workorder.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
	<data>
        <record model="ir.ui.view" id="workorderbioelectric_print">
            <field name="name">workorderbioelectric.print</field>
            <field name="model">repair.workorderimproved</field>
            <field name="inherit_id" ref="repair_workorder_mejorado.form_repair_workorder_mejorado"/>
            <field name="arch" type="xml">
                <xpath expr="//div[@class='oe_right oe_button_box']" position="inside">
					<div class="workorderbioelectric_button_box oe_right oe_button_box" id="workorderbioelectric_button_container"></div>
				</xpath>
            </field>
        </record>
	</data>
</openerp>