Update one2many field with Onchange . Odoo 14

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I tried to update One2many field with the following function called in pos.order.line model because of problem of not saving the field 'tax_ids_after_fiscal_position' Here is my code :

class PosOrderLine(models.Model):
    _inherit = "pos.order.line" 

    @api.onchange('product_id')
    def _onchange_product_id(self):
        self.tax_ids_after_fiscal_position = self.product_id.taxes_id
        self.write({'tax_ids_after_fiscal_position': [(4, self.product_id.taxes_id)]})

I got the following error :

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 639, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 315, in _handle_exception
    raise exception.with_traceback(None) from new_cause
AttributeError: 'account.tax' object has no attribute 'ref'

What's wrong please? Any help? Thanks.

odoo orm inheritance oop python
1 Answers

Please don't use write inside onchange.

@api.onchange('product_id')
def _onchange_product_id(self):
    self.tax_ids_after_fiscal_position =  [(6, 0,self.product_id.taxes_id.ids)]
user_6745980
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