I am using trunk version (maybe here is the problem) and I have changed the rml header in report configuration tab inside company and when I click in "Preview Header/Footer" I can see my changes but when I print some report (sale order, invoice, etc.) I can't. The header is still the Odoo's default one.
Anyone knows why?
check "Reload from Attachment" boolean is not checked in settings->technical->action->reports->your_report
It was checked. Thank you anyway.