Index: Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Views/AssemblyResultTotalViewTest.cs
===================================================================
diff -u -r0a1e00c14da142df178d43f87af86906f170842b -r299e146af0e5e51db326806c46d169241cb634ca
--- Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Views/AssemblyResultTotalViewTest.cs	(.../AssemblyResultTotalViewTest.cs)	(revision 0a1e00c14da142df178d43f87af86906f170842b)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Views/AssemblyResultTotalViewTest.cs	(.../AssemblyResultTotalViewTest.cs)	(revision 299e146af0e5e51db326806c46d169241cb634ca)
@@ -68,6 +68,7 @@
         private const string totalControlName = "totalAssemblyCategoryGroupControl";
         private const string failureMechanismsWithProbabilityControlName = "failureMechanismsWithProbabilityAssemblyControl";
         private const string failureMechanismsWithoutProbabilityControlName = "failureMechanismsWithoutProbabilityAssemblyControl";
+        private const string assemblyResultOutdatedWarning = "Assemblageresultaat is verouderd. Druk op de \"Assemblageresultaat verversen\" knop om opnieuw te berekenen.";
         private Form testForm;
 
         private static IEnumerable<TestCaseData> CellFormattingStates
@@ -127,24 +128,27 @@
                 Assert.AreEqual(DockStyle.Top, groupBox.Dock);
                 Assert.AreEqual("Gecombineerd veiligheidsoordeel", groupBox.Text);
 
-                var tableLayOutPanel = (TableLayoutPanel) groupBox.Controls["assemblyResultTableLayoutPanel"];
-                Assert.AreEqual(2, tableLayOutPanel.ColumnCount);
-                Assert.AreEqual(3, tableLayOutPanel.RowCount);
-                Assert.AreEqual(DockStyle.Fill, tableLayOutPanel.Dock);
+                var tableLayoutPanel = (TableLayoutPanel) groupBox.Controls["assemblyResultTableLayoutPanel"];
+                Assert.AreEqual(2, tableLayoutPanel.ColumnCount);
+                Assert.AreEqual(3, tableLayoutPanel.RowCount);
+                Assert.AreEqual(DockStyle.Fill, tableLayoutPanel.Dock);
 
-                var totalResultLabel = (Label) tableLayOutPanel.GetControlFromPosition(0, 0);
+                var totalResultLabel = (Label) tableLayoutPanel.GetControlFromPosition(0, 0);
                 Assert.AreEqual("Totaal", totalResultLabel.Text);
-                var failureMechanismsWithProbabilityLabel = (Label) tableLayOutPanel.GetControlFromPosition(0, 1);
+                var failureMechanismsWithProbabilityLabel = (Label) tableLayoutPanel.GetControlFromPosition(0, 1);
                 Assert.AreEqual("Groepen 1 en 2", failureMechanismsWithProbabilityLabel.Text);
-                var failureMechanismsWithoutProbablityLabel = (Label) tableLayOutPanel.GetControlFromPosition(0, 2);
+                var failureMechanismsWithoutProbablityLabel = (Label) tableLayoutPanel.GetControlFromPosition(0, 2);
                 Assert.AreEqual("Groepen 3 en 4", failureMechanismsWithoutProbablityLabel.Text);
-                Assert.IsInstanceOf<AssessmentSectionAssemblyCategoryGroupControl>(tableLayOutPanel.GetControlFromPosition(1, 0));
-                Assert.IsInstanceOf<AssessmentSectionAssemblyControl>(tableLayOutPanel.GetControlFromPosition(1, 1));
-                Assert.IsInstanceOf<AssessmentSectionAssemblyCategoryGroupControl>(tableLayOutPanel.GetControlFromPosition(1, 2));
+                Assert.IsInstanceOf<AssessmentSectionAssemblyCategoryGroupControl>(tableLayoutPanel.GetControlFromPosition(1, 0));
+                Assert.IsInstanceOf<AssessmentSectionAssemblyControl>(tableLayoutPanel.GetControlFromPosition(1, 1));
+                Assert.IsInstanceOf<AssessmentSectionAssemblyCategoryGroupControl>(tableLayoutPanel.GetControlFromPosition(1, 2));
 
                 var datagridViewControl = (DataGridViewControl) new ControlTester("dataGridViewControl").TheObject;
                 Assert.AreEqual(DockStyle.Fill, datagridViewControl.Dock);
 
+                ErrorProvider warningProvider = GetWarningProvider(view);
+                Assert.AreEqual(4, warningProvider.GetIconPadding(button));
+
                 Assert.IsInstanceOf<IView>(view);
                 Assert.IsInstanceOf<UserControl>(view);
                 Assert.IsNull(view.Data);
@@ -387,89 +391,110 @@
         }
 
         [Test]
-        public void GivenFormWithAssemblyResultTotalViewWithOutdatedContent_WhenRefreshingAssemblyResults_ThenRefreshButtonDisabled()
+        public void GivenFormWithAssemblyResultTotalViewWithOutdatedContent_WhenRefreshingAssemblyResults_ThenRefreshButtonDisabledAndWarningCleared()
         {
             // Given
             var assessmentSection = new AssessmentSection(new Random(21).NextEnumValue<AssessmentSectionComposition>());
 
-            using (ShowAssemblyResultTotalView(assessmentSection))
+            using (AssemblyResultTotalView view = ShowAssemblyResultTotalView(assessmentSection))
             {
                 assessmentSection.NotifyObservers();
 
                 // Precondition
                 ButtonTester buttonTester = GetRefreshAssemblyResultButtonTester();
-                Assert.IsTrue(buttonTester.Properties.Enabled);
+                Button button = buttonTester.Properties;
+                Assert.IsTrue(button.Enabled);
+                ErrorProvider warningProvider = GetWarningProvider(view);
+                Assert.AreEqual(assemblyResultOutdatedWarning, warningProvider.GetError(button));
 
                 // When
                 buttonTester.Click();
 
                 // Then 
-                Assert.IsFalse(buttonTester.Properties.Enabled);
+                Assert.IsFalse(button.Enabled);
+                Assert.IsEmpty(warningProvider.GetError(button));
             }
         }
 
         [Test]
-        public void GivenFormWithAssemblyResultTotalView_WhenAssessmentSectionNotifiesObservers_ThenRefreshButtonEnabled()
+        public void GivenFormWithAssemblyResultTotalView_WhenAssessmentSectionNotifiesObservers_ThenRefreshButtonEnabledAndWarningSet()
         {
             // Given
             var assessmentSection = new AssessmentSection(new Random(21).NextEnumValue<AssessmentSectionComposition>());
 
-            using (ShowAssemblyResultTotalView(assessmentSection))
+            using (AssemblyResultTotalView view = ShowAssemblyResultTotalView(assessmentSection))
             {
                 // Precondition
                 ButtonTester buttonTester = GetRefreshAssemblyResultButtonTester();
-                Assert.IsFalse(buttonTester.Properties.Enabled);
+                Button button = buttonTester.Properties;
+                Assert.IsFalse(button.Enabled);
+                ErrorProvider warningProvider = GetWarningProvider(view);
+                Assert.IsEmpty(warningProvider.GetError(button));
 
                 // When
                 assessmentSection.NotifyObservers();
 
                 // Then 
                 Assert.IsTrue(buttonTester.Properties.Enabled);
+                Assert.AreEqual(assemblyResultOutdatedWarning, warningProvider.GetError(button));
             }
         }
 
         [Test]
-        public void GivenFormWithAssemblyResultTotalView_WhenFailureMechanismNotifiesObservers_ThenRefreshButtonEnabled()
+        public void GivenFormWithAssemblyResultTotalView_WhenFailureMechanismNotifiesObservers_ThenRefreshButtonEnabledAndWarningSet()
         {
             // Given
             var assessmentSection = new AssessmentSection(new Random(21).NextEnumValue<AssessmentSectionComposition>());
 
-            using (ShowAssemblyResultTotalView(assessmentSection))
+            using (AssemblyResultTotalView view = ShowAssemblyResultTotalView(assessmentSection))
             {
                 // Precondition
                 ButtonTester buttonTester = GetRefreshAssemblyResultButtonTester();
-                Assert.IsFalse(buttonTester.Properties.Enabled);
+                Button button = buttonTester.Properties;
+                Assert.IsFalse(button.Enabled);
+                ErrorProvider warningProvider = GetWarningProvider(view);
+                Assert.IsEmpty(warningProvider.GetError(button));
 
                 // When
                 assessmentSection.StabilityStoneCover.NotifyObservers();
 
                 // Then 
                 Assert.IsTrue(buttonTester.Properties.Enabled);
+                Assert.AreEqual(assemblyResultOutdatedWarning, warningProvider.GetError(button));
             }
         }
 
         [Test]
-        public void GivenFormWithAssemblyResultTotalView_WhenCalculationNotifiesObservers_ThenRefreshButtonEnabled()
+        public void GivenFormWithAssemblyResultTotalView_WhenCalculationNotifiesObservers_ThenRefreshButtonEnabledAndWarningSet()
         {
             // Given
             var assessmentSection = new AssessmentSection(new Random(21).NextEnumValue<AssessmentSectionComposition>());
             var calculation = new TestHeightStructuresCalculation();
             assessmentSection.HeightStructures.CalculationsGroup.Children.Add(calculation);
 
-            using (ShowAssemblyResultTotalView(assessmentSection))
+            using (AssemblyResultTotalView view = ShowAssemblyResultTotalView(assessmentSection))
             {
                 // Precondition
                 ButtonTester buttonTester = GetRefreshAssemblyResultButtonTester();
-                Assert.IsFalse(buttonTester.Properties.Enabled);
+                Button button = buttonTester.Properties;
+                Assert.IsFalse(button.Enabled);
+                ErrorProvider warningProvider = GetWarningProvider(view);
+                Assert.IsEmpty(warningProvider.GetError(button));
 
                 // When
                 calculation.NotifyObservers();
 
                 // Then 
                 Assert.IsTrue(buttonTester.Properties.Enabled);
+                Assert.AreEqual(assemblyResultOutdatedWarning, warningProvider.GetError(button));
             }
         }
 
+        private static ErrorProvider GetWarningProvider(AssemblyResultTotalView resultControl)
+        {
+            return TypeUtils.GetField<ErrorProvider>(resultControl, "warningProvider");
+        }
+
         #region View test helpers
 
         private AssemblyResultTotalView ShowAssemblyResultTotalView()