Hello, I have some report made in other module for sale.order model.

That report usually I attached it to an email template, but I want reused it in other module to put as message log on the sale orders view. I just need get the pdf but I can not found good example(in old API) to do something that simple.

I have seen some examples in the new API:

report_name = 'external_id_of_your_report'
datas=self.env['report'].get_pdf(self, report_name)

 And I try this:

pdf = self.pool.get('report').get_pdf(cr, uid, sale_order_id, report_name)

But return me "error index out of range".

Help.