When I generate a report in pdf I create an attachment and I don't want it. I looked at the report module and found this:

# Save the pdf in attachment if marked
    if reporthtml[0] is not False and save_in_attachment.get(reporthtml[0]):
        with open(pdfreport_path, 'rb') as pdfreport:
            attachment = {
                'name': save_in_attachment.get(reporthtml[0]),
                'datas': base64.encodestring(pdfreport.read()),
                'datas_fname': save_in_attachment.get(reporthtml[0]),
                'res_model': save_in_attachment.get('model'),
                'res_id': reporthtml[0],
            }
            try:
                self.env['ir.attachment'].create(attachment)
            except AccessError:
                _logger.info("Cannot save PDF report %r as attachment", attachment['name'])
            else:
                _logger.info('The PDF document %s is now saved in the database',
                             attachment['name'])

    pdfdocuments.append(pdfreport_path)
except:
    raise

# Save the pdf in attachment if marked

That means there's a check button that enables or disables the option, right?

EDIT: I would like to know how to disable it in both odoo 8 and odoo 10