many2many_checkboxes widget error when used inside of a one2many field

Question

I have a One2many field in my form view.
And that One2many field has a Many2many field in it.
If I apply -> widget="many2many_checkboxes" for that Many2many field, an error raises if I add a line to One2many field and save it.
Im using Odoo 16.

The table below is an example for my situation. (One2many field in a form view)
field1
field2
field3
many2many field

many2many_checkboxes

Thanks

UncaughtPromiseError > OwlError
Uncaught Promise > Invalid loop expression
OwlError: Invalid loop expres

Support GeminateCS · Accepted Answer

Dear Oguzhan,
In odoo 16,the widget=many2many_checkboxesis not supported directly within a One2many field.The many2many_checkboxes widget is designed to be used with many2many fields,not within the One2many fields.
If you want to display a many2many field as checkboxes within a One2many field,
you can achieve this by creating-a custom widget and implementing the desired functionality.
I hope this infomation is helpful to you.
Feel free for further assistance on contact@geminatecs\.com [1]
Thank\

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