Odoo Filter Domain Many2one Field using Parent Id

Question

I have a Many2one field, where the comodel_name is the same with parent model.

This is the parent model

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

    ...
    account_receivable_line = fields.One2many(...)
    ...

And this is the child model

class AccountReceivableLine(models.Model):
    _name = '...'

    ...
    from_order_id = fields.Many2one('sale.order', string='Sale Order')
    ...

As you can see, the comodel_name for from_order_id field is sale.order itself, where the sale.order is the parent model. I don't want the parent record show in from_order_id

I'm able to achive this feature using the domain filter in XML

<field name="from_order_id" domain="[('id', '!=', parent.id)]"/>

But I can't use XML domain filter, for some reason I need to use the python domain filter

return {'domain': {'from_order_id': [
                ('id', '!=', rec.parent.id), # This is not working
                ('partner_id', '=', rec.partner_id.id),
                ... # Another complex filter
            ]}}

The ('id', '!=', rec.parent.id) filter is not working in python code. How can I achieve that feature?