Hey all, writing some Odoo modules to get into module development.

I have a wizard.py​ that specifies:

class MyWizard(models.TransientModel):
    _name = 'my.wizard'
    _description = 'Wizard'
    line_ids = fields.One2many("my.wizard.line", "wizard_id", string="Lines")

And a wizard_line.py​that has:

class MyWizardLine(models.TransientModel):
    _name = 'my.wizard.line'
    _description = 'Wizard Line'
    wizard_id = fields.Many2one('my.wizard', string="Wizard")
    sale_line_id = fields.Many2one('sale.order.line', string="Sale Order Line")
    product_id = fields.Many2one('product.product', string="Product", required=True)

Both are being imported in __init__.py​:

from . import wizard
from . import wizard_line

I have a view under views/wizard_view.xml​:

<odoo>
    <record id="my_wizard_form" model="ir.ui.view">
        <field name="name">my.wizard.form</field>
        <field name="model">my.wizard</field>
        <field name="arch" type="xml">
            <form string="This is a wizard">
                <group>
                    <field name="sale_id" readonly="1"/>
                    <field name="line_ids">
                        <tree>
                            <field name="product_id"/>
                        </tree>
                    </field>
                </group>
                <footer>
                    <button string="Cancel" class="btn-secondary" special="cancel"/>
                </footer>
            </form>
        </field>
    </record>
</odoo>

But this part:

<field name="line_ids">
	​<tree>
   	​<field name="product_id"/>
	​</tree>
</field>

Throws an error saying:

Field "product_id" does not exist in model "my.wizard"

It appears as if the view is trying to access product_id​ directly on my.wizard​ while it should grab the one that's available through the line_ids​ One2many reference to my.wizard.line​?

Am I doing this wrong?