After you have edited the report the first time in OpenOffice it will be stored in database table ir_act_report_xml in fields:

• report_rml_content_data (RML) and
• report_sxw_content_data (SXW)

The report is only taken from file if those fields are empty, which is the case after a fresh install.

If you cannot see any change after the direct edition, you must clear the db by following.

1.Open pgAdmin. check your report id in ir_act_report_xml.

2.Open a query.

SELECT id FROM ir_act_report_xml WHERE model = 'sale.order';

3.put the id (ir_act_report_xml.id) result into place of your_id

update ir_act_report_xml SET report_rml_content_data = NULL WHERE id = your_id;

4.Run and enjoy the rml edition. :-)