Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PropertyClasses/GrassCoverErosionInwardsInputContextProperties.cs
===================================================================
diff -u -re5658f822fa85cab8e99cb3069867d3a87867386 -rbb4c3689ba695776176d0a03d24e5025b27594ed
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PropertyClasses/GrassCoverErosionInwardsInputContextProperties.cs	(.../GrassCoverErosionInwardsInputContextProperties.cs)	(revision e5658f822fa85cab8e99cb3069867d3a87867386)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PropertyClasses/GrassCoverErosionInwardsInputContextProperties.cs	(.../GrassCoverErosionInwardsInputContextProperties.cs)	(revision bb4c3689ba695776176d0a03d24e5025b27594ed)
@@ -65,8 +65,8 @@
             set
             {
                 data.WrappedData.DikeProfile = value;
+                AssignUnassignCalculations.Update(data.FailureMechanism, data.Calculation);
                 data.WrappedData.NotifyObservers();
-                //AssignUnAssignCalculations.Update(data.FailureMechanism, data.Calculation);
             }
         }
 
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs
===================================================================
diff -u -rd207738be4ce6f50f4e3e00839ea433acea10bbd -rbb4c3689ba695776176d0a03d24e5025b27594ed
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision d207738be4ce6f50f4e3e00839ea433acea10bbd)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/GrassCoverErosionInwardsGuiPlugin.cs	(.../GrassCoverErosionInwardsGuiPlugin.cs)	(revision bb4c3689ba695776176d0a03d24e5025b27594ed)
@@ -44,6 +44,7 @@
 using Ringtoets.GrassCoverErosionInwards.Forms.Views;
 using Ringtoets.GrassCoverErosionInwards.Plugin.FileImporter;
 using Ringtoets.GrassCoverErosionInwards.Service;
+using Ringtoets.GrassCoverErosionInwards.Utils;
 using Ringtoets.HydraRing.IO;
 using GrassCoverErosionInwardsDataResources = Ringtoets.GrassCoverErosionInwards.Data.Properties.Resources;
 using GrassCoverErosionInwardsFormsResources = Ringtoets.GrassCoverErosionInwards.Forms.Properties.Resources;
@@ -536,23 +537,25 @@
             using (var view = new GrassCoverErosionInwardsDikeProfileSelectionDialog(Gui.MainWindow, nodeData.AvailableDikeProfiles))
             {
                 view.ShowDialog();
-                GenerateCalculations(nodeData.WrappedData, view.SelectedDikeProfiles);
+                GenerateCalculations(nodeData.WrappedData, nodeData.FailureMechanism, view.SelectedDikeProfiles);
             }
             nodeData.NotifyObservers();
         }
 
-        private void GenerateCalculations(CalculationGroup target, IEnumerable<DikeProfile> dikeProfiles)
+        private void GenerateCalculations(CalculationGroup target, GrassCoverErosionInwardsFailureMechanism failureMechanism, IEnumerable<DikeProfile> dikeProfiles)
         {
             foreach (var profile in dikeProfiles)
             {
-                target.Children.Add(new GrassCoverErosionInwardsCalculation
+                var calculation = new GrassCoverErosionInwardsCalculation
                 {
                     Name = NamingHelper.GetUniqueName(target.Children, profile.Name, c => c.Name),
                     InputParameters =
                     {
                         DikeProfile = profile
                     }
-                });
+                };
+                target.Children.Add(calculation);
+                AssignUnassignCalculations.Update(failureMechanism, calculation);
             }
         }
 
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/Ringtoets.GrassCoverErosionInwards.Plugin.csproj
===================================================================
diff -u -r626c54ec06c0074be690c1a7046081293b0289a8 -rbb4c3689ba695776176d0a03d24e5025b27594ed
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/Ringtoets.GrassCoverErosionInwards.Plugin.csproj	(.../Ringtoets.GrassCoverErosionInwards.Plugin.csproj)	(revision 626c54ec06c0074be690c1a7046081293b0289a8)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Plugin/Ringtoets.GrassCoverErosionInwards.Plugin.csproj	(.../Ringtoets.GrassCoverErosionInwards.Plugin.csproj)	(revision bb4c3689ba695776176d0a03d24e5025b27594ed)
@@ -153,6 +153,10 @@
       <Name>Ringtoets.GrassCoverErosionInwards.Service</Name>
       <Private>False</Private>
     </ProjectReference>
+    <ProjectReference Include="..\Ringtoets.GrassCoverErosionInwards.Utils\Ringtoets.GrassCoverErosionInwards.Utils.csproj">
+      <Project>{99573570-EE00-4264-8147-26A1B25DB23F}</Project>
+      <Name>Ringtoets.GrassCoverErosionInwards.Utils</Name>
+    </ProjectReference>
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Properties\Resources.resx">
Fisheye: Tag bb4c3689ba695776176d0a03d24e5025b27594ed refers to a dead (removed) revision in file `Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/AssignUnAssignCalculations.cs'.
Fisheye: No comparison available.  Pass `N' to diff?
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/AssignUnassignCalculations.cs
===================================================================
diff -u
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/AssignUnassignCalculations.cs	(revision 0)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/AssignUnassignCalculations.cs	(revision bb4c3689ba695776176d0a03d24e5025b27594ed)
@@ -0,0 +1,77 @@
+// Copyright (C) Stichting Deltares 2016. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Ringtoets.Common.Data.FailureMechanism;
+using Ringtoets.GrassCoverErosionInwards.Data;
+
+namespace Ringtoets.GrassCoverErosionInwards.Utils
+{
+    /// <summary>
+    /// Utility class for data synchronization of the <see cref="GrassCoverErosionInwardsFailureMechanismSectionResult.Calculation"/> 
+    /// of <see cref="GrassCoverErosionInwardsFailureMechanismSectionResult"/> objects.
+    /// </summary>
+    public static class AssignUnassignCalculations
+    {
+        /// <summary>
+        /// Update <see cref="GrassCoverErosionInwardsFailureMechanismSectionResult"/> objects which used or can use the <see cref="GrassCoverErosionInwardsCalculation"/>.
+        /// </summary>
+        /// <param name="failureMechanism">The <see cref="GrassCoverErosionInwardsFailureMechanism"/> containing the 
+        /// <see cref="GrassCoverErosionInwardsFailureMechanismSectionResult"/> objects.</param>
+        /// <param name="calculation">The <see cref="GrassCoverErosionInwardsCalculation"/>.</param>
+        /// <exception cref="ArgumentNullException">When any input parameter is <c>null</c>.</exception>
+        public static void Update(GrassCoverErosionInwardsFailureMechanism failureMechanism, GrassCoverErosionInwardsCalculation calculation)
+        {
+            if (failureMechanism == null)
+            {
+                throw new ArgumentNullException("failureMechanism");
+            }
+            if (calculation == null)
+            {
+                throw new ArgumentNullException("calculation");
+            }
+
+            // The FailureMechanismSection which contains the calculation whose dikeprofile has been updated.
+            FailureMechanismSection failureMechanismSection = GrassCoverErosionInwardsHelper.FailureMechanismSectionForCalculation(failureMechanism.SectionResults, calculation);
+
+            // All SectionResults (0 or 1) which don't contain the calculation, but do have it assigned, have their calculation set to null.
+            IEnumerable<GrassCoverErosionInwardsFailureMechanismSectionResult> sectionResultsUsingCalculation = failureMechanism.SectionResults.Where(sr => sr.Calculation != null && sr.Calculation.Equals(calculation));
+            foreach (var sectionResult in sectionResultsUsingCalculation)
+            {
+                if (!sectionResult.Section.Equals(failureMechanismSection))
+                {
+                    sectionResult.Calculation = null;
+                }
+            }
+
+            // Assign the calculation to the SectionResult which contains it, if that SectionResult currently has no calculation set.
+            foreach (var sectionResult in failureMechanism.SectionResults)
+            {
+                if (sectionResult.Section.Equals(failureMechanismSection) && sectionResult.Calculation == null)
+                {
+                    sectionResult.Calculation = calculation;
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/Ringtoets.GrassCoverErosionInwards.Utils.csproj
===================================================================
diff -u -re5658f822fa85cab8e99cb3069867d3a87867386 -rbb4c3689ba695776176d0a03d24e5025b27594ed
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/Ringtoets.GrassCoverErosionInwards.Utils.csproj	(.../Ringtoets.GrassCoverErosionInwards.Utils.csproj)	(revision e5658f822fa85cab8e99cb3069867d3a87867386)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/Ringtoets.GrassCoverErosionInwards.Utils.csproj	(.../Ringtoets.GrassCoverErosionInwards.Utils.csproj)	(revision bb4c3689ba695776176d0a03d24e5025b27594ed)
@@ -44,7 +44,7 @@
     <Compile Include="..\..\..\..\Core\Common\src\Core.Common.Version\GlobalAssembly.cs">
       <Link>Properties\GlobalAssembly.cs</Link>
     </Compile>
-    <Compile Include="AssignUnAssignCalculations.cs" />
+    <Compile Include="AssignUnassignCalculations.cs" />
     <Compile Include="GrassCoverErosionInwardsHelper.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Integration.Test/GrassCoverErosionInwardsInputContextPropertiesIntegrationTest.cs
===================================================================
diff -u
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Integration.Test/GrassCoverErosionInwardsInputContextPropertiesIntegrationTest.cs	(revision 0)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Integration.Test/GrassCoverErosionInwardsInputContextPropertiesIntegrationTest.cs	(revision bb4c3689ba695776176d0a03d24e5025b27594ed)
@@ -0,0 +1,151 @@
+using System.Collections.Generic;
+using System.Linq;
+using Core.Common.Base;
+using Core.Common.Base.Geometry;
+using NUnit.Framework;
+using Rhino.Mocks;
+using Ringtoets.Common.Data.AssessmentSection;
+using Ringtoets.Common.Data.FailureMechanism;
+using Ringtoets.GrassCoverErosionInwards.Data;
+using Ringtoets.GrassCoverErosionInwards.Forms.PresentationObjects;
+using Ringtoets.GrassCoverErosionInwards.Forms.PropertyClasses;
+
+namespace Ringtoets.GrassCoverErosionInwards.Integration.Test
+{
+    [TestFixture]
+    public class GrassCoverErosionInwardsInputContextPropertiesIntegrationTest
+    {
+        private MockRepository mockRepository;
+
+        [SetUp]
+        public void SetUp()
+        {
+            mockRepository = new MockRepository();
+        }
+
+        [Test]
+        public void DikeProfile_CalculationDikeProfileChangedToMatchOtherSection_FirstSectionResultCalculationNullSecondSectionResultCalculationSet()
+        {
+            // Setup
+            var assessmentSectionMock = mockRepository.StrictMock<IAssessmentSection>();
+            mockRepository.ReplayAll();
+
+            var dikeProfile1 = new DikeProfile(new Point2D(0.51, 0.51), new RoughnessPoint[0], new Point2D[0]);
+            var dikeProfile2 = new DikeProfile(new Point2D(1.51, 1.51), new RoughnessPoint[0], new Point2D[0]);
+
+            var calculation1 = new GrassCoverErosionInwardsCalculation
+            {
+                InputParameters =
+                {
+                    DikeProfile = dikeProfile1
+                }
+            };
+
+            var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
+
+            failureMechanism.DikeProfiles.Add(dikeProfile1);
+            failureMechanism.DikeProfiles.Add(dikeProfile2);
+
+            failureMechanism.CalculationsGroup.Children.Add(calculation1);
+
+            failureMechanism.DikeProfiles.Add(dikeProfile1);
+            failureMechanism.DikeProfiles.Add(dikeProfile2);
+
+            failureMechanism.AddSection(new FailureMechanismSection("firstSection", new List<Point2D>
+            {
+                new Point2D(0.0, 0.0), new Point2D(1.1, 1.1)
+            }));
+            failureMechanism.AddSection(new FailureMechanismSection("secondSection", new List<Point2D>
+            {
+                new Point2D(1.1, 1.1), new Point2D(2.2, 2.2)
+            }));
+
+            var sectionResults = failureMechanism.SectionResults.ToArray();
+            sectionResults[0].Calculation = calculation1;
+
+            var inputContext = new GrassCoverErosionInwardsInputContext(calculation1.InputParameters, calculation1, failureMechanism, assessmentSectionMock);
+
+            var properties = new GrassCoverErosionInwardsInputContextProperties
+            {
+                Data = inputContext
+            };
+
+            // Call
+            properties.DikeProfile = dikeProfile2;
+
+            // Assert
+            Assert.AreEqual(2, sectionResults.Length);
+            Assert.IsNull(sectionResults[0].Calculation);
+            Assert.AreSame(calculation1, sectionResults[1].Calculation);
+            mockRepository.VerifyAll();
+        }
+
+        [Test]
+        public void DikeProfile_CalculationDikeProfileChangedToMatchOtherSection_FirstSectionResultCalculationNullSecondSectionResultCalculationUnchanged()
+        {
+            // Setup
+            var assessmentSectionMock = mockRepository.StrictMock<IAssessmentSection>();
+            mockRepository.ReplayAll();
+
+            var dikeProfile1 = new DikeProfile(new Point2D(0.51, 0.51), new RoughnessPoint[0], new Point2D[0]);
+            var dikeProfile2 = new DikeProfile(new Point2D(1.51, 1.51), new RoughnessPoint[0], new Point2D[0]);
+
+            var calculation1 = new GrassCoverErosionInwardsCalculation
+            {
+                Name = "firstCalculation",
+                InputParameters =
+                {
+                    DikeProfile = dikeProfile1
+                }
+            };
+            var calculation2 = new GrassCoverErosionInwardsCalculation
+            {
+                Name = "secondCalculation",
+                InputParameters =
+                {
+                    DikeProfile = dikeProfile2
+                }
+            };
+
+            var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
+
+            failureMechanism.DikeProfiles.Add(dikeProfile1);
+            failureMechanism.DikeProfiles.Add(dikeProfile2);
+
+            failureMechanism.CalculationsGroup.Children.Add(calculation1);
+            failureMechanism.CalculationsGroup.Children.Add(calculation2);
+
+            failureMechanism.DikeProfiles.Add(dikeProfile1);
+            failureMechanism.DikeProfiles.Add(dikeProfile2);
+
+            failureMechanism.AddSection(new FailureMechanismSection("firstSection", new List<Point2D>
+            {
+                new Point2D(0.0, 0.0), new Point2D(1.1, 1.1)
+            }));
+            failureMechanism.AddSection(new FailureMechanismSection("secondSection", new List<Point2D>
+            {
+                new Point2D(1.1, 1.1), new Point2D(2.2, 2.2)
+            }));
+
+            var sectionResults = failureMechanism.SectionResults.ToArray();
+            sectionResults[0].Calculation = calculation1;
+            sectionResults[1].Calculation = calculation2;
+
+            var inputContext = new GrassCoverErosionInwardsInputContext(calculation1.InputParameters, calculation1, failureMechanism, assessmentSectionMock);
+
+            var properties = new GrassCoverErosionInwardsInputContextProperties
+            {
+                Data = inputContext
+            };
+
+            // Call
+            properties.DikeProfile = dikeProfile2;
+
+            // Assert
+            Assert.AreEqual(2, sectionResults.Length);
+            Assert.IsNull(sectionResults[0].Calculation);
+            Assert.AreSame(calculation2, sectionResults[1].Calculation);
+            mockRepository.VerifyAll();
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Integration.Test/Ringtoets.GrassCoverErosionInwards.Integration.Test.csproj
===================================================================
diff -u -r773a5af872870723a798116250805f47f165d966 -rbb4c3689ba695776176d0a03d24e5025b27594ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Integration.Test/Ringtoets.GrassCoverErosionInwards.Integration.Test.csproj	(.../Ringtoets.GrassCoverErosionInwards.Integration.Test.csproj)	(revision 773a5af872870723a798116250805f47f165d966)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Integration.Test/Ringtoets.GrassCoverErosionInwards.Integration.Test.csproj	(.../Ringtoets.GrassCoverErosionInwards.Integration.Test.csproj)	(revision bb4c3689ba695776176d0a03d24e5025b27594ed)
@@ -59,6 +59,7 @@
   <ItemGroup>
     <Compile Include="GrassCoverErosionInwardsCalculationActivityIntegrationTest.cs" />
     <Compile Include="GrassCoverErosionInwardsCalculationServiceIntegrationTest.cs" />
+    <Compile Include="GrassCoverErosionInwardsInputContextPropertiesIntegrationTest.cs" />
     <Compile Include="GrassCoverErosionInwardsScenariosViewIntegrationTest.cs" />
     <Compile Include="IntegrationTestHelper.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -91,6 +92,10 @@
       <Project>{9a2d67e6-26ac-4d17-b11a-2b4372f2f572}</Project>
       <Name>Core.Common.Controls</Name>
     </ProjectReference>
+    <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Gui\Core.Common.Gui.csproj">
+      <Project>{30e4c2ae-719e-4d70-9fa9-668a9767fbfa}</Project>
+      <Name>Core.Common.Gui</Name>
+    </ProjectReference>
     <ProjectReference Include="..\..\..\..\Core\Common\src\Core.Common.Utils\Core.Common.Utils.csproj">
       <Project>{F49BD8B2-332A-4C91-A196-8CCE0A2C7D98}</Project>
       <Name>Core.Common.Utils</Name>
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Utils.Test/AssignUnassignCalculationsTest.cs
===================================================================
diff -u
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Utils.Test/AssignUnassignCalculationsTest.cs	(revision 0)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Utils.Test/AssignUnassignCalculationsTest.cs	(revision bb4c3689ba695776176d0a03d24e5025b27594ed)
@@ -0,0 +1,147 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Core.Common.Base.Geometry;
+using NUnit.Framework;
+using Ringtoets.Common.Data.FailureMechanism;
+using Ringtoets.GrassCoverErosionInwards.Data;
+
+namespace Ringtoets.GrassCoverErosionInwards.Utils.Test
+{
+    [TestFixture]
+    public class AssignUnassignCalculationsTest
+    {
+        [Test]
+        public void Update_NullFailureMechanism_ThrowsArgumentNullException()
+        {
+            // Setup
+            var calculation = new GrassCoverErosionInwardsCalculation();
+
+            // Call
+            TestDelegate call = () => AssignUnassignCalculations.Update(null, calculation);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("failureMechanism", paramName);
+        }
+
+        [Test]
+        public void Update_NullCalculation_ThrowsArgumentNullException()
+        {
+            // Setup
+            var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
+
+            // Call
+            TestDelegate call = () => AssignUnassignCalculations.Update(failureMechanism, null);
+
+            // Assert
+            string paramName = Assert.Throws<ArgumentNullException>(call).ParamName;
+            Assert.AreEqual("calculation", paramName);
+        }
+
+        [Test]
+        public void Update_CalculationDikeProfileChangedToMatchOtherSection_FirstSectionResultCalculationNullSecondSectionResultCalculationSet()
+        {
+            // Setup
+            var dikeProfile1 = new DikeProfile(new Point2D(0.51, 0.51), new RoughnessPoint[0], new Point2D[0]);
+            var dikeProfile2 = new DikeProfile(new Point2D(1.51, 1.51), new RoughnessPoint[0], new Point2D[0]);
+
+            var calculation1 = new GrassCoverErosionInwardsCalculation
+            {
+                InputParameters =
+                {
+                    DikeProfile = dikeProfile1
+                }
+            };
+
+            var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
+
+            failureMechanism.DikeProfiles.Add(dikeProfile1);
+            failureMechanism.DikeProfiles.Add(dikeProfile2);
+
+            failureMechanism.CalculationsGroup.Children.Add(calculation1);
+
+            failureMechanism.DikeProfiles.Add(dikeProfile1);
+            failureMechanism.DikeProfiles.Add(dikeProfile2);
+
+            failureMechanism.AddSection(new FailureMechanismSection("firstSection", new List<Point2D>
+            {
+                new Point2D(0.0, 0.0), new Point2D(1.1, 1.1)
+            }));
+            failureMechanism.AddSection(new FailureMechanismSection("secondSection", new List<Point2D>
+            {
+                new Point2D(1.1, 1.1), new Point2D(2.2, 2.2)
+            }));
+
+            var sectionResults = failureMechanism.SectionResults.ToArray();
+            sectionResults[0].Calculation = calculation1;
+
+            // Call
+            calculation1.InputParameters.DikeProfile = dikeProfile2;
+            AssignUnassignCalculations.Update(failureMechanism, calculation1);
+
+            // Assert
+            Assert.AreEqual(2, sectionResults.Length);
+            Assert.IsNull(sectionResults[0].Calculation);
+            Assert.AreSame(calculation1, sectionResults[1].Calculation);
+        }
+
+        [Test]
+        public void Update_CalculationDikeProfileChangedToMatchOtherSection_FirstSectionResultCalculationNullSecondSectionResultCalculationUnchanged()
+        {
+            // Setup
+            var dikeProfile1 = new DikeProfile(new Point2D(0.51, 0.51), new RoughnessPoint[0], new Point2D[0]);
+            var dikeProfile2 = new DikeProfile(new Point2D(1.51, 1.51), new RoughnessPoint[0], new Point2D[0]);
+
+            var calculation1 = new GrassCoverErosionInwardsCalculation
+            {
+                Name = "firstCalculation",
+                InputParameters =
+                {
+                    DikeProfile = dikeProfile1
+                }
+            };
+            var calculation2 = new GrassCoverErosionInwardsCalculation
+            {
+                Name = "secondCalculation",
+                InputParameters =
+                {
+                    DikeProfile = dikeProfile2
+                }
+            };
+
+            var failureMechanism = new GrassCoverErosionInwardsFailureMechanism();
+
+            failureMechanism.DikeProfiles.Add(dikeProfile1);
+            failureMechanism.DikeProfiles.Add(dikeProfile2);
+
+            failureMechanism.CalculationsGroup.Children.Add(calculation1);
+            failureMechanism.CalculationsGroup.Children.Add(calculation2);
+
+            failureMechanism.DikeProfiles.Add(dikeProfile1);
+            failureMechanism.DikeProfiles.Add(dikeProfile2);
+
+            failureMechanism.AddSection(new FailureMechanismSection("firstSection", new List<Point2D>
+            {
+                new Point2D(0.0, 0.0), new Point2D(1.1, 1.1)
+            }));
+            failureMechanism.AddSection(new FailureMechanismSection("secondSection", new List<Point2D>
+            {
+                new Point2D(1.1, 1.1), new Point2D(2.2, 2.2)
+            }));
+
+            var sectionResults = failureMechanism.SectionResults.ToArray();
+            sectionResults[0].Calculation = calculation1;
+            sectionResults[1].Calculation = calculation2;
+
+            // Call
+            calculation1.InputParameters.DikeProfile = dikeProfile2;
+            AssignUnassignCalculations.Update(failureMechanism, calculation1);
+
+            // Assert
+            Assert.AreEqual(2, sectionResults.Length);
+            Assert.IsNull(sectionResults[0].Calculation);
+            Assert.AreSame(calculation2, sectionResults[1].Calculation);
+        }
+    }
+}
\ No newline at end of file
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Utils.Test/Ringtoets.GrassCoverErosionInwards.Utils.Test.csproj
===================================================================
diff -u -rd207738be4ce6f50f4e3e00839ea433acea10bbd -rbb4c3689ba695776176d0a03d24e5025b27594ed
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Utils.Test/Ringtoets.GrassCoverErosionInwards.Utils.Test.csproj	(.../Ringtoets.GrassCoverErosionInwards.Utils.Test.csproj)	(revision d207738be4ce6f50f4e3e00839ea433acea10bbd)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Utils.Test/Ringtoets.GrassCoverErosionInwards.Utils.Test.csproj	(.../Ringtoets.GrassCoverErosionInwards.Utils.Test.csproj)	(revision bb4c3689ba695776176d0a03d24e5025b27594ed)
@@ -46,6 +46,7 @@
     <Reference Include="System.Core" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="AssignUnassignCalculationsTest.cs" />
     <Compile Include="GrassCoverErosionInwardsHelperTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>