Lots assignment(Serial)

def create_stock_picking(self):
     pick_obj = self.env["stock.picking"]
        for data in self:
            if (data.no_of_children - data.no_of_death_children) > 0:
                kid_no = data.no_of_children - data.no_of_death_children
                move_vals = []
                ml_vals = []
                animal_tags = []

                for animal in data.livestock_ids.filtered(lambda kid: kid.livestock_state != 'dead'):
                    # Search for an existing lot based on the tag
                    lot2 = self.env['stock.lot'].search(
                        [('name', '=', animal.tag), ('product_id', '=', data.livestock_id.product_id.id)], limit=1)

                    # # If the lot does not exist, create it
                    if not lot2:
                        lot2 = self.env['stock.lot'].create({
                            'name': animal.tag,
                            'product_id': data.livestock_id.product_id.id,
                        })

                    # Append move line values
                    ml_vals.append((0, 0, {
                        'product_id': data.livestock_id.product_id.id,
                        'reserved_uom_qty': 1,
                        'qty_done': 1,
                        'product_uom_id': data.livestock_id.product_id.uom_id.id,
                        'location_dest_id': data.get_default_mrp_location_dest_id(),
                        'location_id': data.get_default_mrp_location_src_id(),
                        'lot_id': lot2.id
                    }))
                    animal_tags.append(lot2.id)

                move_vals.append((0, 0, {
                    'name': f'({data.livestock_id.product_id.name}) production from {data.livestock_id.tag}',
                    'product_id': data.livestock_id.product_id.id,
                    'product_uom_qty': kid_no,
                    'quantity_done': kid_no,
                    'product_uom': data.livestock_id.product_id.uom_id.id,
                    'location_dest_id': data.get_default_mrp_location_dest_id(),
                    'location_id': data.get_default_mrp_location_src_id(),
                    'move_line_ids': ml_vals,
                    # 'lot_ids': [(4, id) for id in animal_tags]
                }))

                pick_values = {
                    'note': f'Animal Production from {self.name}',
                    'company_id': data.company_id.id if data.company_id else 1,
                    'location_dest_id': data.get_default_mrp_location_dest_id(),
                    'location_id': data.get_default_mrp_location_src_id(),
                    # 'move_ids_without_package': move_vals,
                    'move_line_ids_without_package': ml_vals,
                    'move_type': 'direct',
                    'picking_type_id': data.get_default_mrp_picking_type(),
                    'origin': data.name,
                    'livestock_id': data.livestock_id.id,
                    'livestock_production_id': data.id
                }

                pick_id = pick_obj.create(pick_values)

                pick_id.action_confirm()

                # Check if quantities are reserved or done, and then validate
                if any(line.qty_done or line.product_uom_qty for line in pick_id.move_line_ids):
                    pick_id.button_validate()
                else:
                    raise ValidationError("Cannot validate transfer: no quantities reserved or done.")

                data.write({'picking_id': pick_id.id, 'state': 'confirmed'})
        return True