<xpath expr="//field[@name='partner_id']" position="replace">
<field name="partner_id" on_change="onchange_partner_id(partner_id, context)" context="{'search_default_customer': 1, 'form_view_ref': 'bikecoop.view_bikecoop_members_form'}" attrs="{'readonly': [('state','in', ('paid', 'done', 'invoiced'))]}" required="1" placeholder="LASTNAME Firstname" />
</xpath>
-
+ <xpath expr="//field[@name='price_subtotal_incl']" position="after">
+ <field name="is_fixed_price" invisible="1"/>
+ </xpath>
+ <xpath expr="//field[@name='price_unit']" position="attributes">
+ <attribute name="attrs">{'readonly':[('is_fixed_price','=', True)]}</attribute>
+ </xpath>
</field>
</record>
</data>