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When defining a one2many field on a wizard (TransientModel), you need to specify the column of the related model that points to the wizard.

How should I do this in case of a orm.TransientModel?

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Just like every other model.

See the example of wizard.select.move.template and wizard.select.move.template.line

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Thanks Lorenzo. But don't you think this foreign key on the 'other' object is strange? What happens if the wizard instance record is removed? Then this foreign key 'template_id' is invalid?

It depends on what referential action you set as 'ondelete'

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