ARGOMENTO: fatture e ddt

    def _get_picking_ids(self, cr, uid, context=None):
        invoice_obj = self.pool.get('account.invoice')
        res = []
        if context.has_key('active_ids'):
            for invoice in invoice_obj.browse(cr, uid, context['active_ids'], context=context):
                for sale_order in invoice.sale_order_ids:
                    for picking in sale_order.picking_ids:
                        res.append((picking.id, picking.name))
        return res