diff --git a/stock_usability/models/__init__.py b/stock_usability/models/__init__.py
index f0ccbe2..2161a1d 100644
--- a/stock_usability/models/__init__.py
+++ b/stock_usability/models/__init__.py
@@ -5,6 +5,7 @@ from . import stock_location
 from . import stock_location_route
 from . import stock_warehouse_orderpoint
 from . import stock_quant
+from . import stock_quant_package
 from . import stock_inventory
 from . import procurement_group
 from . import procurement_scheduler_log
diff --git a/stock_usability/models/stock_quant_package.py b/stock_usability/models/stock_quant_package.py
new file mode 100644
index 0000000..f5052c7
--- /dev/null
+++ b/stock_usability/models/stock_quant_package.py
@@ -0,0 +1,31 @@
+# Copyright 2024 Akretion France (https://www.akretion.com/)
+# @author: Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import api, models
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class StockQuantPackage(models.Model):
+    _inherit = "stock.quant.package"
+
+    @api.model
+    def _cron_auto_unpack_on_internal_locations(self):
+        # Problem in v10: when you manage packs in Odoo for customer pickings,
+        # you have the following problem: when you return a customer picking,
+        # if you return all the products that were in the same pack, the pack
+        # is returned, so you have in your stock one or several quants
+        # inside a pack. This is a problem when you want to ship those
+        # products again.
+        # I provide the code in this module, but not the cron, because in some
+        # scenarios, you may want to have packs in your stock.
+        # Just add the cron in the specific module of your project.
+        # Underlying problem solved in Odoo v11. Don't port that to v14 !
+        logger.info('START cron auto unpack on internal locations')
+        int_locs = self.env['stock.location'].search([('usage', '=', 'internal')])
+        packages = self.search([('location_id', 'in', int_locs.ids)])
+        logger.info('Unpacking %d packages on internal locations', len(packages))
+        packages.unpack()
+        logger.info('END cron auto unpack on internal locations')