contract/contract_update_last_date_invoiced/views/contract_views.xml

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
    <record id="contract_contract_form_view_inherit" model="ir.ui.view">
        <field name="name">contract.contract.form.inherit</field>
        <field name="model">contract.contract</field>
        <field name="inherit_id" ref="contract.contract_contract_form_view" />
        <field name="arch" type="xml">
            <xpath
                expr="//form/sheet/notebook/page[@name='recurring_invoice_line']/field[@name='contract_line_fixed_ids']/tree"
                position="attributes"
            >
                <attribute name="editable" />
            </xpath>
        </field>
    </record>
</odoo>