I'm new to odoo and trying to add a new module to sales.
I have added a module and a field called job_no, it is placed in the sales order tree view.
my goal is to automatically generate sequential values in the job_no field when the confirm button is pressed.

but I'm having trouble connecting the confirmation button that is already in odoo.
here is the code i have made:
this is a .py file

from odoo import api, fields, models, _

class sale_warisan(models.Model):
    _inherit = 'sale.order'

    jenis_pekerjaan = fields.Selection([
        ('jasa', 'Jasa'),
        ('proyek', 'Proyek'),
        ('belt', 'Belt'),
        ('aksesoris', 'Aksesoris'),
    ], required=True, default='aksesoris', tracking=True)

    job_no = fields.Char(string='Job Number', tracking=True, copy=False, readonly=True,
                         default=lambda self: _('New'))

# ignore this one, because I'm still looking for tutorials on the web and youtube, but I haven't been able to get it working
    # def create(self, vals):
    #     if vals.get('job_no', _('New')) == _('New'):
    #         vals['job_no'] = self.env['ir.sequence'].next_by_code('sales.order') or _('New')
    #     res = super(sale_warisan, self).create(vals)
    #     return res

and this .xml

xml version="1.0" encoding="UTF-8" ?>


    
    id="tampilan_quotation_form_warisan" model="ir.ui.view">
        name="name">tampilan.quotation.warisan
        name="model">sale.order
        name="inherit_id" ref="sale.view_order_form"/>
        name="arch" type="xml">
            expr="//field[@name='partner_id']" position="after">
                name="jenis_pekerjaan"/>
            
        
    

    
    id="tampilan_quotation_tree_warisan" model="ir.ui.view">
        name="name">tampilan.quotation.warisan
        name="model">sale.order
        name="inherit_id" ref="sale.view_quotation_tree"/>
        name="arch" type="xml">
            expr="//field[@name='partner_id']" position="after">
                name="jenis_pekerjaan"/>
            
        
    

    
    
        id="urutan_job_no" model="ir.sequence">
            name="name">Job Number
            name="code">sale.order
            name="padding">4
        
    

    
    id="tampilan_order_tree_warisan" model="ir.ui.view">
        name="name">tampilan.order.warisan
        name="model">sale.order
        name="inherit_id" ref="sale.view_order_tree"/>
        name="arch" type="xml">
            expr="//field[@name='name']" position="before">
                name="job_no"/>