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I was not able to post a piece of xml code in this Forum.
I do not think this is a good way to support developers.

Hi, 

Hope this reference will help you. 

Mejor respuesta

as far as i know, there isn't any widget called one2many_list in Odoo.
There is onyl widget="one2many"

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Hi,

The widget=”one2many_list” is used when we want to view a field as one2many.

In python file

account_ids = fields.One2many('account.fiscal.position.account', 'position_id', string='Account Mapping')

In XML

<field name="account_ids"  widget="one2many_list">
<tree string="Values">
<field name="name"/>
</tree>
</field>

Regards

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But where is the widget "one2many_list" defined??
I can't find any definition in the code and the browser console tells me "Missing widget"

@Klaus-Dieter Gundermann: Highlighted Ibrahim Boudmir's comment to become an answer. one2many_list just isn't a thing hence you get that error.

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