manufacture/mrp_operations_start_without_material/views/mrp_routing_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="mrp_routing_workcenter_form_view_SWM" model="ir.ui.view">
            <field name="name">mrp.routing.workcenter.form.swm</field>
            <field name="model">mrp.routing.workcenter</field>
            <field name="inherit_id" ref="mrp_operations_extension.mrp_routing_workcenter_form_view_inh" />
            <field name="arch" type="xml">
                <field name="previous_operations_finished" position="after">
                    <field name="init_without_material"/>
                </field>
           </field>
        </record>
    </data>
</openerp>