sale_order.xml

<odoo>
    <record id="sale_order_agreement_form_view" model="ir.ui.view">
        <field name="name">sale.order.agreement.form.view</field>
        <field name="model">sale.order</field>
        <field name="inherit_id" ref="sale.view_order_form" />
        <field name="arch" type="xml">
            <field name="client_order_ref" position="after">
                <field name="agreement_id" />
            </field>
            <field name="partner_id" position="after">
                <field
                    name="agreement_type_id"
                    groups="agreement.group_use_agreement_type"
                />
            </field>
        </field>
    </record>
</odoo>