Hi, i have a problem to remove the 'action_quotation_send' button from the header of sale order form

<record id="view_order_form" model="ir.ui.view">
        <field name="name">sale.order.form</field>
        <field name="model">sale.order</field>
        <field name="arch" type="xml">
            <form string="Sales Order" version="7.0">
                <header>
                ....
                <button name="action_quotation_send" string="Send by Email" type="object" states="draft" class="oe_highlight" groups="base.group_user"/>
                <button name="action_quotation_send" string="Send by Email" type="object" states="sent,progress,manual" groups="base.group_user"/>
                ....

this is the code that I try to use to delete this two buttons from the header

<record model="ir.ui.view" id="view_order_form_ceo">
    <field name="name">view_order_form_ceo</field>
    <field name="model">sale.order</field>
    <field name="inherit_id" ref="sale.view_order_form"/>
    <field name="arch" type="xml">
        <data>
            <!--
            <button name="action_quotation_send" position="replace" />

            <xpath expr="/form/header/button[@name='action_quotation_send']"
            position="replace" />
            -->
            <button name="action_quotation_send" position="attributes">
                <attribute name="invisible">1</attribute>
            </button>
        </data>
    </field>
</record>

none of the three options work

what is the code to remove this buttons from the view!!! I'm going crazy trying to do that.