Hello Benoit,

You need to inherit the sale.order view in you custom module and then try the following code.

Following code will replace the button:

<button name="print_quotation" position="replace">
    <button name="%(your_action)d" string="Print" type="action" states="draft" class="oe_highlight"/>
</button>

After this, you need to update your module.

Thanks,

Serpent Consulting Services

Thank you for your answer.

After searching deep, I don't need to change the default button action. I must change the default report opened by the button.

Doing this manually is like : Configuration -> Actions -> Reports remove the 'standard' sale order for example and make my new report service name = sale.order

But the problem is that OpenERP will rollback my changes at each module update.

I can create a new module to define my report but how do I delete the entry brought by sale_order module ? : report auto="False" id="report_sale_order" model="sale.order" name="sale.order" rml="sale/report/sale_order.rml" string="Quotation / Order" usage="default"/>