orden_cobro/wizard_select_invoice_view.xml

<?xml version="1.0"?>
<openerp>
  <data>
    <record id="view_wizard_select_invoice_form" model="ir.ui.view">
      <field name="name">wizard.select.invoice.form</field>
      <field name="model">wizard.select.invoice</field>
      <field name="type">form</field>
      <field name="arch" type="xml">
        <form string="Seleccionar Facturas">
          <group>
            <field name="invoice_ids" widget="many2many_tags"/>
          </group>
          <footer>
            <button string="Aceptar" type="object" name="confirmar_seleccion" class="oe_highlight"/>
            <button string="Cancelar" class="oe_link" special="cancel"/>
          </footer>
        </form>
      </field>
    </record>

    <record id="action_wizard_select_invoice" model="ir.actions.act_window">
      <field name="name">Seleccionar Facturas</field>
      <field name="res_model">wizard.select.invoice</field>
      <field name="view_type">form</field>
      <field name="view_mode">form</field>
      <field name="target">new</field>
    </record>
  </data>
</openerp>