[FIX] stock: raise a warning if the user deactivates 'lot & serial numbers' settings while products use it

The "lots & serial numbers" feature can be deactivated at any point.
If there are active products that are tracked, either by lot or serial number,
it can be confusing since deactivating it will hide the relevant fields.
Therefore we raise a warning at onchange if there are tracked active products.

opw 2036173

closes odoo/odoo#35108

Signed-off-by: Nans Lefebvre (len) <len@odoo.com>

addons/stock/i18n/stock.pot

@@ -6495,6 +6495,13 @@ msgstr ""
 msgid "You need to supply a Lot/Serial number for product %s."
 msgstr ""
 
+#. module: stock
+#: code:addons/stock/models/res_config_settings.py:70
+#, python-format
+msgid "You should not remove the 'lots and serial numbers' option while the following products are still tracked by lot or serial number:\n"
+" %s"
+msgstr ""
+
 #. module: stock
 #: code:addons/stock/models/product.py:394
 #: code:addons/stock/models/product.py:538

addons/stock/models/res_config_settings.py

@@ -1,7 +1,8 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import api, fields, models
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
 
 
 class ResConfigSettings(models.TransientModel):
@@ -64,6 +65,13 @@ class ResConfigSettings(models.TransientModel):
     def _onchange_group_stock_production_lot(self):
         if not self.group_stock_production_lot:
             self.group_lot_on_delivery_slip = False
+        tracked_products = self.env['product.template'].search([('tracking', 'in', ['lot', 'serial']),])
+        if not self.group_stock_production_lot and tracked_products:
+            names = ", ".join(tracked_products.mapped('display_name') if len(tracked_products) <= 10
+                    else tracked_products[:10].mapped('display_name') + ["..."])
+            raise UserError(_("You should not remove the 'lots and serial numbers' "
+                              "option while the following products are still tracked by lot "
+                              "or serial number:\n %s") % names)
 
     @api.onchange('group_stock_adv_location')
     def onchange_adv_location(self):