Hi  loay elhaj,

You can use domain to filter the Many2one field,

product_ids = fields.Many2many('product.template')

product_id = fields.Many2one('product.template' , domain=[('id', 'in', product_ids.ids)])

where product_ids is the many2many field and product_id is the Many2one field. 


Hope it Helps,

Kiran K

I solved this issue by returning many2one field domain depending on many2many field results on changing the desired field. Like following:

@api.onchange('product_id')
def _onchange_product_alternative_domain(self):
    for line in self:
        if line.product_id:
            return {'domain': {'alternative_product_id': [('id', 'in', line.product_id.alternative_product_ids.ids)]}}

Here alternative_product_ids is many2many field.

Error raised
ValueError: Invalid domain term ('id', 'in', 'bom_id.product_ids.ids')