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Hi to all, does any one knows how to prepopulate a data on a one2many field? I mean, when a user clicks "Add an item" on a one2many fields some fields from this line will populated? I have here the image.

 

Any help is much appreciated.

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The image is not shown.  Anyway, it is a combination of _defaults value (and overriding the default_get method of ORM) and on_change on the fields that are given _defaults.

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You could use context to set the values of the fields at one2many field
In res.partner table, odoo uses context to pass the values of Company to its Contacts.  Refer:https://github.com/odoo/odoo/blob/8.0/openerp/addons/base/res/res_partner_view.xml#L191

context={'default_country_id':country_id}

(*) default_FIELDNAME ==> set value for your particular field
(*) search_default_FILTERNAME ==> sets the search filter by default

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