Index: Core/Common/test/Core.Common.Utils.Test/Extensions/EnumerableExtensionsTest.cs
===================================================================
diff -u -ra163c5f082694baf5cd491ea36baf6fb040fe868 -rda57945a7b1346cbd6cedb57477e4329d75b02c8
--- Core/Common/test/Core.Common.Utils.Test/Extensions/EnumerableExtensionsTest.cs	(.../EnumerableExtensionsTest.cs)	(revision a163c5f082694baf5cd491ea36baf6fb040fe868)
+++ Core/Common/test/Core.Common.Utils.Test/Extensions/EnumerableExtensionsTest.cs	(.../EnumerableExtensionsTest.cs)	(revision da57945a7b1346cbd6cedb57477e4329d75b02c8)
@@ -172,11 +172,27 @@
         }
 
         [Test]
-        public void HasMultipleUniqueValues_WithUniqueItems_ReturnsFalse()
+        public void HasMultipleUniqueValues_WithSingleUniqueItem_ReturnsFalse()
         {
             // Setup
             var items = new List<int>
             {
+                1
+            };
+
+            // Call
+            bool hasNonDistinct = items.HasMultipleUniqueValues(t => t);
+
+            // Assert
+            Assert.IsFalse(hasNonDistinct);
+        }
+
+        [Test]
+        public void HasMultipleUniqueValues_WithMultipleItemsOneUnique_ReturnsFalse()
+        {
+            // Setup
+            var items = new List<int>
+            {
                 1,
                 1,
                 1
@@ -197,6 +213,7 @@
             {
                 1,
                 2,
+                2,
                 3
             };
 
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Factories/RingtoetsStackChartDataFactoryTest.cs
===================================================================
diff -u -rf288f9ccb9ac465f017170a59279909d8431fdc7 -rda57945a7b1346cbd6cedb57477e4329d75b02c8
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Factories/RingtoetsStackChartDataFactoryTest.cs	(.../RingtoetsStackChartDataFactoryTest.cs)	(revision f288f9ccb9ac465f017170a59279909d8431fdc7)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Factories/RingtoetsStackChartDataFactoryTest.cs	(.../RingtoetsStackChartDataFactoryTest.cs)	(revision da57945a7b1346cbd6cedb57477e4329d75b02c8)
@@ -79,7 +79,7 @@
             var beta = (RoundedDouble) 3.14;
             var controlItems = new[]
             {
-                new IllustrationPointControlItem(new TestTopLevelIllustrationPoint(), 
+                new IllustrationPointControlItem(new TestTopLevelIllustrationPoint(),
                                                  "WindDirectionName1",
                                                  closingSituation,
                                                  Enumerable.Empty<Stochast>(),
@@ -108,12 +108,37 @@
         }
 
         [Test]
+        public void CreateColumns_SingleClosingSituationsSingleIllustrationPoint_ColumnsAddedToStackChartData()
+        {
+            // Setup
+            var stackChartData = new StackChartData();
+
+            const string closingSituation = "Regular";
+            var beta = (RoundedDouble) 3.14;
+            var controlItems = new[]
+            {
+                new IllustrationPointControlItem(new TestTopLevelIllustrationPoint(),
+                                                 "WindDirectionName1",
+                                                 closingSituation,
+                                                 Enumerable.Empty<Stochast>(),
+                                                 beta)
+            };
+
+            // Call
+            RingtoetsStackChartDataFactory.CreateColumns(controlItems, stackChartData);
+
+            // Assert
+            string[] columns = stackChartData.Columns.ToArray();
+            Assert.AreEqual(1, columns.Length);
+            Assert.AreEqual(controlItems[0].WindDirectionName, columns[0]);
+        }
+
+        [Test]
         public void CreateColumns_DifferentClosingSituations_ColumnsAddedToStackChartData()
         {
             // Setup
             const string closingSituationRegular = "Regular";
             const string closingSituationClosed = "Closed";
-            const string closingSituationOpen = "Open";
             var beta = (RoundedDouble) 3.14;
 
             var stackChartData = new StackChartData();
@@ -131,7 +156,7 @@
                                                  beta),
                 new IllustrationPointControlItem(new TestTopLevelIllustrationPoint(),
                                                  "WindDirection 3",
-                                                 closingSituationOpen,
+                                                 closingSituationClosed,
                                                  Enumerable.Empty<Stochast>(),
                                                  beta)
             };
@@ -144,7 +169,7 @@
             Assert.AreEqual(3, columns.Length);
             Assert.AreEqual($"{controlItems[0].WindDirectionName} ({closingSituationRegular})", columns[0]);
             Assert.AreEqual($"{controlItems[1].WindDirectionName} ({closingSituationClosed})", columns[1]);
-            Assert.AreEqual($"{controlItems[2].WindDirectionName} ({closingSituationOpen})", columns[2]);
+            Assert.AreEqual($"{controlItems[2].WindDirectionName} ({closingSituationClosed})", columns[2]);
         }
 
         [Test]
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Views/IllustrationPointsTableControlTest.cs
===================================================================
diff -u -r566265eddf560e1a0cde3805907760745cb4b830 -rda57945a7b1346cbd6cedb57477e4329d75b02c8
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Views/IllustrationPointsTableControlTest.cs	(.../IllustrationPointsTableControlTest.cs)	(revision 566265eddf560e1a0cde3805907760745cb4b830)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Views/IllustrationPointsTableControlTest.cs	(.../IllustrationPointsTableControlTest.cs)	(revision da57945a7b1346cbd6cedb57477e4329d75b02c8)
@@ -112,7 +112,7 @@
             DataGridView dataGridView = ControlTestHelper.GetDataGridView(testForm, "DataGridView");
 
             DataGridViewRowCollection rows = dataGridView.Rows;
-            Assert.AreEqual(2, rows.Count);
+            Assert.AreEqual(3, rows.Count);
 
             DataGridViewCellCollection cells = rows[0].Cells;
             Assert.AreEqual(4, cells.Count);
@@ -128,6 +128,13 @@
             Assert.AreEqual("1/4", cells[calculatedProbabilityColumnIndex].FormattedValue);
             Assert.AreEqual("0,70000", cells[calculatedReliabilityColumnIndex].FormattedValue);
 
+            cells = rows[2].Cells;
+            Assert.AreEqual(4, cells.Count);
+            Assert.AreEqual("NE", cells[windDirectionColumnIndex].FormattedValue);
+            Assert.AreEqual("Open", cells[closingScenarioColumnIndex].FormattedValue);
+            Assert.AreEqual("1/5", cells[calculatedProbabilityColumnIndex].FormattedValue);
+            Assert.AreEqual("0,80000", cells[calculatedReliabilityColumnIndex].FormattedValue);
+
             Assert.IsTrue(dataGridView.Columns[closingScenarioColumnIndex].Visible);
         }
 
@@ -189,7 +196,7 @@
             DataGridViewRowCollection rows = dataGridView.Rows;
 
             // Precondition
-            Assert.AreEqual(2, rows.Count);
+            Assert.AreEqual(3, rows.Count);
 
             // Call
             control.Data = null;
@@ -296,7 +303,12 @@
                                                  "SSE",
                                                  "Open",
                                                  Enumerable.Empty<Stochast>(),
-                                                 new RoundedDouble(5, 0.7))
+                                                 new RoundedDouble(5, 0.7)),
+                new IllustrationPointControlItem(new TestTopLevelIllustrationPoint(),
+                                                 "NE",
+                                                 "Open",
+                                                 Enumerable.Empty<Stochast>(),
+                                                 new RoundedDouble(5, 0.8))
             };
         }
     }