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According to the documentation (https://www.odoo.com/documentation/15.0/developer/reference/backend/orm.html?highlight=onchange#odoo.api.onchange

 Warning

It is not possible for a one2many or many2many field to modify itself via onchange. This is a webclient limitation - see #2693.

But does that also mean i cannot change a field on one of the objects in the m2m relation ?

I would like to add a tag to an object coming into the many2many and removing the tage when it is removed from the m2m field.

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Best Answer

Hello Jaco Waes


First of all Add M2M field in the model and create onchange method in the purchase order line model.

Please find Example in Comment.

I hope This will help you.

Thanks & Regards,
Email: odoo@aktivsoftware.com
Skype: kalpeshmaheshwari

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Please used this example.

class PurchaseOrdrLine(models.Model):
_inherit = 'purchase.order.line'

@api.onchange('product_id')
def m2m_product_onchange(self):
Your Code........

pol_m2m_ids = fields.Many2many('purchase.order.line', string='M2M Ids')

<field name="pol_m2m_ids" widget="one2many">
<tree editable="bottom">
<field name="product_id"/>
<field name="name"/>
<field name="product_uom_category_id"/>
</tree>
</field>

Best Answer

This means that you cannot define an onchange function for onemany and many2many fields. That is you cannot trigger any function when there is a change in onemany and many2many fields.

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