Odoo - Modified QWeb reports invoice / sales_order and quotations keep being replaced with originals after updates ?
There are two ways, that I know, of that can you protect your work:
1. Use a Custom View reports (own module).
2. The security standard views, by inserting them, before performing the update (in .xml files - for example in account/views/report_invoice.xml)
<data noupdate = "1">
All views without setting "noupdate" are normally overwritten by new version. See: https://doc.odoo.com/6.0/developer/5_18_upgrading_server/
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