I know that, my answer is very late but maybe this will help others:
Odoo 11.0 

Override Request for Quotation  report by adding a group to the access security list of the report.

    <record id="purchase.report_purchase_quotation" model="ir.actions.report">
        <field name="name">Request for Quotation</field>
        <field name="model">purchase.order</field>
        <field name="report_name">purchase.report_purchasequotation</field>
        <field name="groups_id" eval="[(4, ref('hide_prices.view_price'))]"/>
    </record>