Odoo uses the same stock.production.lot object for Lot and Serial Number. In case of serial number, it is normal that this serial number is located in one location at a time, but in the case of Lot inventory, it can be divided into different locations, and it is not possible to display multiple locations in a single field, that's why Odoo added a smart button (Location) in the Header section of form view. If the user clicks on the Location Smart button, he will know where the inventory is.

If you want to show all locations on the list/tree you need to create a custom field (many2many) which calculates the field it will check where the serial/lot number is stored and add those locations.

You can refer to the following code snippet

location_ids = fields.Many2many('stock.location', compute='_compute_locations', string="Location")

def _compute_locations(self):
    for lot in self:
        location_ids = self.env['stock.quant'].search([('lot_id', '=', lot.id), ('quantity', '>', 0), ('location_id.usage', '=', 'internal')]).mapped('location_id').ids
        lot.location_ids = [(6, 0, location_ids)]

Hello Sagar

Thanks you very much for your effort. However, it seems Im not skilled enough for this, and I don't have access to the server. Im only using Studio for customisations, so I don't really know how to configure the field using your code snippet.

I guess I should be able to create the field and configure it using studio and field settings, but I couldn't figure out how to.

PS. For clarification, each Serial Number is only located in one location, but since there are multiple Serial Numbers for a product, it gives different locations for each row in Lot/Serial tree view.