Hi Cybrosys, thank you for the solution. It seems to work, the service_request_ids are all loaded according to the correct service_id. However, service_request_ids is not selectable (it's read-only).

Hi Duong Nguyen, thank you for your response.
It (domain="[('service_id', '=', service_id)]") doesn't work. When I select it, it cannot load the record

The relationship between service_id and service_request_ids are One2Many.
class AhamoveService(models.Model):
_name = 'ahamove.service'
request_ids = fields.One2many('ahamove.service.request', 'service_id', 'Requests')

class AhamoveServiceRequest(models.Model):
_name = 'ahamove.service.request'
service_id = fields.Many2one('ahamove.service', string='Service')

Which mean when user choose service_id on form view it will automatically load all related record of 'ahamove.service.request' which have that 'service_id'
If that so, i suggest using compute store with readonly=False

Yes, that's right,
But as far as I understand,
domain="[('service_id', '=', service_id)]" and compute method is a form of the static domain. This means that every time you access the form, it will work as expected. But when you onchange service_id it will not work. I have tried doing this.

No, i haven't seen any one implement onchange method like you did.
Normally , when implement onchange , it will be used to change some other field value and the most important thing of onchange is not store on the database level.
So i guest u should remove your onchange method and do something like this
@api.depends('service_id')
def _compute_request_ids(self):
all_ahamove_service_request = self.env["ahamove.service.request"].search([("service_id", "in", self.service_id.ids)])
for r in self:
if r.service_id:
r.request_ids = all_ahamove_service_request.filtered(lambda req: req.service_id == r.service_id )
else:
r.request_ids = False

Thanks Duong, I will try your solution now.

Thanks so much, Adil Akbar

Hi Nicolás,
#python-code
class ChooseDeliveryCarrier(models.TransientModel):
_inherit = 'choose.delivery.carrier'

​service_id = fields.Many2one('ahamove.service', string='Service')
​service_request_domain = fields.Binary(default=[])
​service_request_ids = fields.Many2many('ahamove.service.request', ​'estimate_request_rel','choose_id', 'request_id', string='Request Type')

@api.onchange('service_id')
​def _onchange_service_id(self):
​ ​for rec in self:
​ ​if rec.service_id:
​ ​rec.service_request_domain = [('service_id', '=', rec.service_id.id)]

#xml-code
<?xml version="1.0" encoding="utf-8"?>
<odoo>
<record id="view_choose_delivery_carrier_form_with_provider" model="ir.ui.view">
<field name="name">view.choose.delivery.carrier.form.with.provider</field>
<field name="model">choose.delivery.carrier</field>
<field name="inherit_id" ref="delivery.choose_delivery_carrier_view_form" />
<field name="arch" type="xml">
<field name="carrier_id" position="after">
<field name="service_id"/>
<field name="service_request_ids" widget="many2many_tags" domain="service_request_domain"/>
<field name="service_request_domain" invisible="1"/>
</field>
</field>
</record>
</odoo>

Thanks and best regards,