Index: Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/TreeNodeInfos/PipingFailureMechanismContextTreeNodeInfoTest.cs
===================================================================
diff -u -r7206def3cee84d518d3f7ea1b76e05e3163b8aea -r6833a6c92024007966c7fd99a955b234653f2ef8
--- Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/TreeNodeInfos/PipingFailureMechanismContextTreeNodeInfoTest.cs	(.../PipingFailureMechanismContextTreeNodeInfoTest.cs)	(revision 7206def3cee84d518d3f7ea1b76e05e3163b8aea)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/TreeNodeInfos/PipingFailureMechanismContextTreeNodeInfoTest.cs	(.../PipingFailureMechanismContextTreeNodeInfoTest.cs)	(revision 6833a6c92024007966c7fd99a955b234653f2ef8)
@@ -57,7 +57,8 @@
         private PipingGuiPlugin plugin;
         private TreeNodeInfo info;
 
-        private const int contextMenuRelevancyIndex = 1;
+        private const int contextMenuRelevancyIndexWhenRelevant = 1;
+        private const int contextMenuRelevancyIndexWhenNotRelevant = 0;
         private const int contextMenuValidateAllIndex = 3;
         private const int contextMenuCalculateAllIndex = 4;
         private const int contextMenuClearIndex = 5;
@@ -645,11 +646,47 @@
             var contextMenu = info.ContextMenuStrip(failureMechanismContext, null, treeViewControl);
 
             // Call
-            contextMenu.Items[contextMenuRelevancyIndex].PerformClick();
+            contextMenu.Items[contextMenuRelevancyIndexWhenRelevant].PerformClick();
 
             // Assert
             Assert.IsFalse(failureMechanism.IsRelevant);
             mocks.VerifyAll();
         }
+
+        [Test]
+        public void ContextMenuStrip_FailureMechanismIsNotRelevantAndClickOnIsRelevantItem_MakeFailureMechanismRelevant()
+        {
+            // Setup
+            var failureMechanismObserver = mocks.Stub<IObserver>();
+            failureMechanismObserver.Expect(o => o.UpdateObserver());
+
+            var failureMechanism = new PipingFailureMechanism
+            {
+                IsRelevant = false
+            };
+            failureMechanism.Attach(failureMechanismObserver);
+
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            var failureMechanismContext = new PipingFailureMechanismContext(failureMechanism, assessmentSection);
+
+            var treeViewControl = mocks.StrictMock<TreeViewControl>();
+            var menuBuilder = new CustomItemsOnlyContextMenuBuilder();
+
+            var gui = mocks.StrictMock<IGui>();
+            gui.Expect(g => g.Get(failureMechanismContext, treeViewControl)).Return(menuBuilder);
+
+            mocks.ReplayAll();
+
+            plugin.Gui = gui;
+
+            var contextMenu = info.ContextMenuStrip(failureMechanismContext, null, treeViewControl);
+
+            // Call
+            contextMenu.Items[contextMenuRelevancyIndexWhenNotRelevant].PerformClick();
+
+            // Assert
+            Assert.IsTrue(failureMechanism.IsRelevant);
+            mocks.VerifyAll();
+        }
     }
 }
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