OpenERP report doesn't work

1. When you have used OpenOffice edited  one of reports,it has stored the report's banary data is database,which caused the problem when you refresh the rml file in server and restart the service but the report is sitll the old one.

2.Solution:using pgAdmin find the table ir_act_report_xml and set both field 'report_rml_content_data' and 'report_sxw_content_data' null,then you will find the changed rml file work again.