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I want to remove the default header and footer from the Quotation / Sale report.
I change <t t-call="web.external_layout"> from report_saleorder_document file to <t t-call="web.basic_layout"> but after I upgrade sale module changes won't happen. Any ideas why? should I upgrade another module as well?
First You need to inherit this in your custom module then make changes and it will affect.
If you change views directly in the original code without creating new views by inheritance, your changes will be overwritten by the next module update.
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