I am trying to replace the existing sales order / quotation PDF report with a custom one:

<!-- REPLACE EXISTING TEMPLATE SALE ORDER -->
        <report
                id="sale.report_saleorder"
                model="sale.order"
                string="Presupuesto / Pedido"
                report_type="qweb-pdf"
                name="custom_reports.saleorder_custom"
                file="custom_reports.saleorder_custom"
                attachment = "(object.state in ('open','paid')) and ('P_'+(object.number or '').replace('/','')+'.pdf')"
        />
        <record id="sale.report_saleorder" model="ir.actions.report.xml">
                <field name="paperformat_id" ref="report.paperformat_euro"/>
        </record>

But unfortunatelly I am getting duplicated entries (the new entry and the old standard one which fails) in the PRINT menu.

Any tips on what I am missing?

There must be something small as similar approach works fine for invoices.

Thanks