Hey

I have a problem that I cant resolve

I want to remove the button "Imprimir" (Print) on the sale orders I just did all like

<xpath expr="//button[@name='invoice_print']" position="replace">
                 <!--add sometihng-->

</xpath>

or

<button name="invoice_print" string="Print" type="object" attrs="{'invisible':['|',('sent','=',True), ('state', '!=', 'open')]}" class="oe_highlight" groups="base.group_user" position="replace">
                  <!--add something-->

</button>

or 

 <xpath expr="//button[@name='invoice_print']" position="attributes">
                <attribute name="invisible">1</attribute>
              </xpath>

And none of those remove the button....

What I did wrong?

Best Regards

my code is this 

<record model="ir.ui.view" id="account_invoice_rule_saft_inherit">
            <field name="name">account.invoice.rule.saft.inherit</field>
            <field name="model">account.invoice</field>
            <field name="inherit_id" ref="account.invoice_form"/>
            <field name="arch" type="xml">
        <header>
              <!--<button name="invoice_print" string="Print" type="object" attrs="{'invisible':['|',('sent','=',True), ('state', '!=', 'open')]}" class="oe_highlight" groups="base.group_user" position="replace">
                  
              </button>-->
              <!--<xpath expr="//button[@name='invoice_print']" position="attributes">
                <attribute name="invisible">1</attribute>
              </xpath>-->
              <xpath expr="//button[@name='invoice_print'][0]" position="attributes">
                <attribute name="invisible">True</attribute>
              </xpath>
              <xpath expr="//button[@name='invoice_print'][1]" position="attributes">
                <attribute name="invisible">True</attribute>
              </xpath>

                 <button name="print_original" type="object" string="Original" attrs="{'invisible':['|','|',('impressoori', '=', True),('impressoall', '=', True),('state','=','draft')]}"/>

                <button name="print_duplicado" type="object" string="Duplicado" attrs="{'invisible':['|','|',('impressodupl', '=', True),('impressoall', '=', True),('state','=','draft')]}"/>  

                <button name="print_triplicado" type="object" string="Triplicado" attrs="{'invisible':['|','|',('impressoall','=',True),('impressotri','=',True),('state','=','draft')]}"/>

                <button name="print_all" type="object" string="Todas as Vias" attrs="{'invisible':['|','|','|','|',('impressoall', '=', True),('impressoori', '=', True),('impressodupl', '=', True),('impressotri', '=', True),('state','=','draft')]}" />

                <button name="print_segunda_via" type="object" string="Segunda Via" attrs="{'invisible':['|',('impressoseg', '=', True),('state','=','draft')]}" />
                
            </header>
        <notebook colspan="4" position="after">
            
        <group col="1">
                <field name="impressodupl" nolabel="0" invisible="1" />
                <field name="impressoori" nolabel="0" invisible="1" />
                <field name="impressotri" nolabel="0" invisible="1" />
                <field name="impressoall" nolabel="0" invisible="1" />
          <field name="impressoseg" nolabel="0" invisible="1" />
          
        </group>
           
          </notebook>
               </field>
        </record>