diff --git a/stock_demand_estimate/__manifest__.py b/stock_demand_estimate/__manifest__.py
index eaa4873fb..0f169e045 100644
--- a/stock_demand_estimate/__manifest__.py
+++ b/stock_demand_estimate/__manifest__.py
@@ -3,7 +3,7 @@
 {
     "name": "Stock Demand Estimate",
     "summary": "Allows to create demand estimates.",
-    "version": "15.0.1.0.1",
+    "version": "16.0.1.0.1",
     "author": "ForgeFlow, Odoo Community Association (OCA)",
     "development_status": "Production/Stable",
     "website": "https://github.com/OCA/stock-logistics-warehouse",
diff --git a/stock_demand_estimate/tests/test_stock_demand_estimate.py b/stock_demand_estimate/tests/test_stock_demand_estimate.py
index fafe0f034..5ede169e3 100644
--- a/stock_demand_estimate/tests/test_stock_demand_estimate.py
+++ b/stock_demand_estimate/tests/test_stock_demand_estimate.py
@@ -3,6 +3,7 @@
 
 from datetime import date, timedelta as td
 
+from odoo.exceptions import UserError
 from odoo.tests.common import TransactionCase
 
 
@@ -165,3 +166,10 @@ class TestStockDemandEstimate(TransactionCase):
         estimate.manual_duration = 5
         estimate._onchange_manual_duration()
         self.assertEqual(estimate.manual_date_to, date_from + td(days=4))
+        estimate._compute_product_quantity()
+        self.assertEqual(estimate.product_qty, 500)
+        with self.assertRaises(UserError):
+            estimate._inverse_product_quantity()
+        estimate.product_uom = False
+        estimate._compute_product_quantity()
+        self.assertEqual(estimate.product_qty, 0)