contract/contract_fieldservice/views/contract_line.xml

<odoo>

    <record id="contract_line_form_view_inherit_fsm" model="ir.ui.view">
        <field name="name">contract.line form view (in contract)</field>
        <field name="model">contract.line</field>
        <field name="inherit_id" ref="contract.contract_line_form_view"/>
        <field name="arch" type="xml">
            <field name="price_unit" position="after">
                <field name="fsm_location_id"/>
            </field>
        </field>
    </record>

</odoo>