Hi all,

I am trying to upgrade a module on odoo18. But I am getting the following error:

RPC_ERROR

Odoo Server Error

Occured on localhost:8996 on model ir.module.module on 2025-10-03 13:44:48 GMT

Traceback (most recent call last):

  File "C:\Program Files\Odoo 18.0.20250814\server\odoo\convert.py", line 555, in _tag_root

    raise ParseError(msg) from None  # Restart with "--log-handler odoo.tools.convert:DEBUG" for complete traceback

    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

odoo.tools.convert.ParseError: while parsing file:/c:/program%20files/odoo%2018.0.20250814/custom/hms_africa/views/cases_views.xml:19

Error while validating view near:

                                    <field name="disb_date"/>

                                    <field name="service"/>

                                    <field name="total"/>

                                </list>

                            </field>

Field "mode_of_brief" does not exist in model "case.notes"

View error context:

{'file': 'c:\\program files\\odoo '

         '18.0.20250814\\custom\\hms_africa\\views\\cases_views.xml',

'line': 40,

'name': 'hms.cases.form',

'view': ir.ui.view(903,),

'view.model': 'hms.cases',

'view.parent': ir.ui.view(),

'xmlid': 'view_hms_cases_form'}

The above server error caused the following client error:

RPC_ERROR: Odoo Server Error

    RPCError@http://localhost:8996/web/assets/e9f7204/web.assets_web.min.js:3145:338

    makeErrorFromResponse@http://localhost:8996/web/assets/e9f7204/web.assets_web.min.js:3148:163

    rpc._rpc/promise</<@http://localhost:8996/web/assets/e9f7204/web.assets_web.min.js:3153:34

Here is are my models

class HmsCase(models.Model):

    _name = 'hms.cases'

    _inherit = ['mail.thread']

    _description = 'HMS Cases Master'

    _rec_name = 'case_name'

    case_name = fields.Char(string="Case Name", tracking=True)

case_note_ids = fields.One2many('case.notes', 'note_id', string="Notes")

class CaseNotes(models.Model):

    _name = 'case.notes'

    _description = 'Case Notes'

    note_id = fields.Many2one('hms.cases', string='Case', required=True)

    note_date = fields.Datetime(string='Date', default=fields.Datetime.now())

    note = fields.Text(string="Note")

    mode_of_brief = fields.Selection([('email', 'EMAIL'),

                                      ('letter', 'OFFICIAL LETTER'),

                                      ('post', 'REGISTERED POST'),

                                      ('other', 'OTHER')],

                                     string="Mode of Brief")

Here is my view:

<?xml version="1.0" encoding="utf-8"?>

<odoo>

    <record id="view_hms_cases_list" model="ir.ui.view">

        <field name="name">hms.cases.list</field>

        <field name="model">hms.cases</field>

        <field name="arch" type="xml">

            <list string="Cases">

                <field name="case_name"/>

            </list>

        </field>

    </record>

    <record id="view_hms_cases_form" model="ir.ui.view">

        <field name="name">hms.cases.form</field>

        <field name="model">hms.cases</field>

        <field name="arch" type="xml">

            <form string="Cases">

                <sheet>

                    <group>

                        <field name="case_name" readonly="status != 'auth_one' and status != 'draft'"/>

                    </group>

                    <field name="case_note_ids" string="Case Notes" mode="list,form">

                        <list default_order="note_date desc" delete="false">

                            <field name="note_date" readonly="1" noupdate="1"/>

                            <field name="note"/>

                        </list>

                        <form string="Case Notes">

                            <group>

                                <field name="note_date" readonly="1" noupdate="1"/>

                                <field name="note"/>

                                <field name="mode_of_brief"/>

                            </group>

                        </form>

                    </field>

                </sheet>

                <chatter/>

            </form>

        </field>

    </record>

    <record id="action_hms_cases" model="ir.actions.act_window">

        <field name="name">Cases</field>

        <field name="res_model">hms.cases</field>

        <field name="view_ids" eval="[Command.clear(),

            (0, 0, {'view_mode': 'list', 'view_id': ref('view_hms_cases_list')}),

            (0, 0, {'view_mode': 'form', 'view_id': ref('view_hms_cases_form')})]"/>

        <field name="view_mode">list,form</field>

        <field name="help" type="html">

            <p class="o_view_nocontent_smiling_face">

                Create a new case

            </p>

        </field>

    </record>

</odoo>

In addition, when i try to do this on Odoo17, it works without any issues. Any assistance will be greatly appreciated. Thanks