Hi,

We can add a domain in the product_id field in purchase order line.

@api.onchange('product_id')
def product_id_on_change(self):
  domain = ([('seller_ids.name', '=', self.partner_id.id)])
  return {'domain': {'product_id': domain}}

Regards

If this in stock.move and in odoo 18 can you help me