<field name="priority" eval="8"/>
<field name="arch" type="xml">
<xpath expr="//button[@name='action_invoice_sent']" position="after">
- <button string="Sent by Email" icon="gtk-ok" type="object" name="action_invoice_sent" attrs="{'invisible': ['|', ('sent','=', True), ('state', '!=', 'paid')]}"/>
+ <button string="Sent by Email" type="object" name="action_invoice_sent" attrs="{'invisible': ['|', ('sent','=', True), ('state', '!=', 'paid')]}"/>
</xpath>
</field>
</record>