If you are on SAAS version, try logging in with user, which has technical features turned on, then going to Settings ->Technical -> Reports -> Reports, find Quotation / Order and click on Search associated QWeb views. When you open report_saleorder_document, you will see the definition of your report - try to remove unnecessary lines and then printing your quotation - that should work just fine.

I think RML is deprecated.  Your best bet would probably be to create a custom module, inherit the view you wish to override (change), and make your changes in XML.  If you're not familiar with module creation, here is a link to get you started:

http://odoo-80.readthedocs.org/en/latest/howtos/website.html#creating-a-basic-module

You can find the name of the view to override by turning on debug mode (go to About Odoo and click "Activate the developer mode") and then go to the view you want to change.  Choose "Manage Views" from the debug menu list, and it should steer you in the right direction.

@Mariusz Mizgier:

I don't have the menu "Settings => Technical => Reports" available with my admin user !

What rights should the user should have to be able to get the Reports command ?

Hello,

The migration to V8 for saas are in progress... your are always not in V8 (version which support Qweb) but that will be probably for the next days...

If you need to edit today you report, you need to use the "OpenERP Designer" to load your report in OpenOffice... You can find more info here : https://www.odoo.com/fr_FR/forum/help-1/question/openerp-online-what-are-the-parameters-for-the-report-designer-or-the-thunderbird-plugin-4900 (response from Denix Ledoux (dle))

If your report is not yet customized, I suggest you to wait the Qweb version which will be editable online via the website editor.

JKE