Can you please post any example, I have no clue how to do this.

@api.onchange('test_domain')

def onchange_test_domain_fiedl(self):

#here use your model to fetch the records

obj = self.search([])

available_ids = []

for i in obj:

# appends the man2one fields idsss

available_ids.append(i.test_domain.id)

return {'domain': {'test_domain': [('id', 'not in', available_ids)]}}

test_domain = fields.Many2one('sale.order', "Testttttttt")

Dont forget to upvote if my answer helps you

Hi Hilar,

Thanks for your Precious time, This is exactly what i wanted.

Thank you sir!