Hello,

I have taken one field in sale order line which is many2one to sale order line.

Now search the record where reference id are same and in that record written the first sale order line id.

For report,

Create a parser class and take method render_html.

Then search the record in the sale order line that line_id is the sale_order_line.id so i get same reference_id record in list and append in the main list.

Because there are many records which have multiple sale order line.

class PackingListReport(models.AbstractModel):

    _name = 'report.work_order.report_packing_list'

    @api.multi

    def render_html(self, data=None):

        family = []

        report_obj = self.env['report']

        work_order_id = self.env['work.order'].browse(self.id)

        for line in work_order_id.work_order_line:

            search_id = work_order_id.work_order_line.search([('order_work_id', '=', self.id), ('reference_id', '=', line.reference_id), ('line_id', '=', line.id)])

            if search_id:

                family.append(search_id)

        report = report_obj._get_report_from_name('work_order.report_packing_list')

        docargs = {

            'doc_ids': self._ids,

            'doc_model': report.model,

            'docs': work_order_id,

            'family': family,

        }

        return report_obj.render('work_order.report_packing_list', docargs)

and this family list append in the dictionary and pass through render method.

So I can easily fetch it into my report template.

Thanks,