Index: Ringtoets/Common/src/Ringtoets.Common.Forms/Helpers/SynchronizeCalculationWithForeshoreProfileHelper.cs
===================================================================
diff -u -r89a67df36f92a18beb34c2978db1332f8525214d -rb7c78a363e31e9911179086d4aa73561deb6b4d4
--- Ringtoets/Common/src/Ringtoets.Common.Forms/Helpers/SynchronizeCalculationWithForeshoreProfileHelper.cs	(.../SynchronizeCalculationWithForeshoreProfileHelper.cs)	(revision 89a67df36f92a18beb34c2978db1332f8525214d)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/Helpers/SynchronizeCalculationWithForeshoreProfileHelper.cs	(.../SynchronizeCalculationWithForeshoreProfileHelper.cs)	(revision b7c78a363e31e9911179086d4aa73561deb6b4d4)
@@ -43,21 +43,23 @@
         public static void UpdateForeshoreProfileDerivedCalculationInput<TInput>(ICalculation<TInput> calculation)
             where TInput : ICalculationInput, IHasForeshoreProfile
         {
-            if (!calculation.InputParameters.IsForeshoreProfileParametersSynchronized)
+            if (calculation.InputParameters.IsForeshoreProfileParametersSynchronized)
             {
-                calculation.InputParameters.SynchronizeForeshoreProfileParameters();
+                return;
+            }
 
-                var affectedObjects = new List<IObservable>
-                {
-                    calculation.InputParameters
-                };
+            calculation.InputParameters.SynchronizeForeshoreProfileParameters();
 
-                affectedObjects.AddRange(RingtoetsCommonDataSynchronizationService.ClearCalculationOutput(calculation));
+            var affectedObjects = new List<IObservable>
+            {
+                calculation.InputParameters
+            };
 
-                foreach (IObservable affectedObject in affectedObjects)
-                {
-                    affectedObject.NotifyObservers();
-                }
+            affectedObjects.AddRange(RingtoetsCommonDataSynchronizationService.ClearCalculationOutput(calculation));
+
+            foreach (IObservable affectedObject in affectedObjects)
+            {
+                affectedObject.NotifyObservers();
             }
         }
     }
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Helpers/SynchronizeCalculationWithForeshoreProfileHelperTest.cs
===================================================================
diff -u
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Helpers/SynchronizeCalculationWithForeshoreProfileHelperTest.cs	(revision 0)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Helpers/SynchronizeCalculationWithForeshoreProfileHelperTest.cs	(revision b7c78a363e31e9911179086d4aa73561deb6b4d4)
@@ -0,0 +1,83 @@
+// Copyright (C) Stichting Deltares 2017. 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 NUnit.Framework;
+using Rhino.Mocks;
+using Ringtoets.Common.Data.Calculation;
+using Ringtoets.Common.Data.DikeProfiles;
+using Ringtoets.Common.Forms.Helpers;
+
+namespace Ringtoets.Common.Forms.Test.Helpers
+{
+    [TestFixture]
+    public class SynchronizeCalculationWithForeshoreProfileHelperTest
+    {
+        [Test]
+        public void UpdateForeshoreProfileDerivedCalculationInput_ForeshoreProfileSynchronized_DoesNotNotifyObservers()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var calculationInputMock = mocks.StrictMock<ICalculationInputWithForeshoreProfile>();
+            calculationInputMock.Expect(ci => ci.IsForeshoreProfileParametersSynchronized).Return(true);
+
+            var calculationMock = mocks.StrictMock<ICalculation<ICalculationInputWithForeshoreProfile>>();
+            calculationMock.Stub(c => c.InputParameters).Return(calculationInputMock);
+            mocks.ReplayAll();
+
+            // Call
+            SynchronizeCalculationWithForeshoreProfileHelper.UpdateForeshoreProfileDerivedCalculationInput(calculationMock);
+
+            // Assert
+            mocks.VerifyAll();
+        }
+
+        [Test]
+        [TestCase(true)]
+        [TestCase(false)]
+        public void UpdateForeshoreProfileDerivedCalculationInput_ForeshoreProfileNotSynchronized_NotifyObservers(bool hasOutput)
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var calculationInputMock = mocks.StrictMock<ICalculationInputWithForeshoreProfile>();
+            calculationInputMock.Expect(ci => ci.IsForeshoreProfileParametersSynchronized).Return(false);
+            calculationInputMock.Expect(ci => ci.SynchronizeForeshoreProfileParameters());
+            calculationInputMock.Expect(ci => ci.NotifyObservers());
+
+            var calculationMock = mocks.StrictMock<ICalculation<ICalculationInputWithForeshoreProfile>>();
+            calculationMock.Stub(c => c.InputParameters).Return(calculationInputMock);
+            calculationMock.Expect(c => c.HasOutput).Return(hasOutput);
+            if (hasOutput)
+            {
+                calculationMock.Expect(c => c.ClearOutput());
+                calculationMock.Expect(c => c.NotifyObservers());
+            }
+            mocks.ReplayAll();
+
+            // Call
+            SynchronizeCalculationWithForeshoreProfileHelper.UpdateForeshoreProfileDerivedCalculationInput(calculationMock);
+
+            // Assert
+            mocks.VerifyAll();
+        }
+
+        public interface ICalculationInputWithForeshoreProfile : ICalculationInput, IHasForeshoreProfile {}
+    }
+}
\ No newline at end of file
Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Ringtoets.Common.Forms.Test.csproj
===================================================================
diff -u -r2702ecf9aaf678cf869dc330f8ff560b3de4672a -rb7c78a363e31e9911179086d4aa73561deb6b4d4
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Ringtoets.Common.Forms.Test.csproj	(.../Ringtoets.Common.Forms.Test.csproj)	(revision 2702ecf9aaf678cf869dc330f8ff560b3de4672a)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Ringtoets.Common.Forms.Test.csproj	(.../Ringtoets.Common.Forms.Test.csproj)	(revision b7c78a363e31e9911179086d4aa73561deb6b4d4)
@@ -73,6 +73,7 @@
     <Compile Include="Helpers\NamingHelperTest.cs" />
     <Compile Include="Helpers\ProbabilityFormattingHelperTest.cs" />
     <Compile Include="Helpers\SelectableHydraulicBoundaryLocationHelperTest.cs" />
+    <Compile Include="Helpers\SynchronizeCalculationWithForeshoreProfileHelperTest.cs" />
     <Compile Include="ImportInfos\RingtoetsImportInfoFactoryTest.cs" />
     <Compile Include="PresentationObjects\InputContextBaseTest.cs" />
     <Compile Include="PresentationObjects\FailureMechanismContextTest.cs" />