Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Importers/IStochasticSoilModelUpdateModelStrategy.cs
===================================================================
diff -u -r8c8285c58f677a2905127f1c3576eb7d6ea4206b -r0122d4ac58ee6f7be4ff804db1f6c65e88ce4562
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Importers/IStochasticSoilModelUpdateModelStrategy.cs	(.../IStochasticSoilModelUpdateModelStrategy.cs)	(revision 8c8285c58f677a2905127f1c3576eb7d6ea4206b)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Importers/IStochasticSoilModelUpdateModelStrategy.cs	(.../IStochasticSoilModelUpdateModelStrategy.cs)	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -40,10 +40,10 @@
         /// <param name="readStochasticSoilModels">The stochastic soil models which were imported.</param>
         /// <param name="sourceFilePath">The path to the source file from which the soil models were imported.</param>
         /// <exception cref="ArgumentNullException">Thrown when any parameter is <c>null</c>.</exception>
-        /// <exception cref="Exception.InnerException">Thrown when applying the strategy failed.
-        /// <see cref="StochasticSoilModelUpdateException"/> is set with the more detailed
+        /// <exception cref="StochasticSoilModelUpdateException">Thrown when applying the strategy failed.
+        /// <see cref="StochasticSoilModelUpdateException.InnerException"/> is set with the more detailed
         /// exception.</exception>
-        /// <returns><see cref="StochasticSoilModelUpdateException"/> of updated instances.</returns>
+        /// <returns>A <see cref="IEnumerable{IObservable}"/> of updated instances.</returns>
         IEnumerable<IObservable> UpdateModelWithImportedData(
             ObservableCollectionWithSourcePath<StochasticSoilModel> targetCollection, 
             IEnumerable<StochasticSoilModel> readStochasticSoilModels, 
Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Importers/ISurfaceLineUpdateSurfaceLineStrategy.cs
===================================================================
diff -u -r8c8285c58f677a2905127f1c3576eb7d6ea4206b -r0122d4ac58ee6f7be4ff804db1f6c65e88ce4562
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Importers/ISurfaceLineUpdateSurfaceLineStrategy.cs	(.../ISurfaceLineUpdateSurfaceLineStrategy.cs)	(revision 8c8285c58f677a2905127f1c3576eb7d6ea4206b)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Importers/ISurfaceLineUpdateSurfaceLineStrategy.cs	(.../ISurfaceLineUpdateSurfaceLineStrategy.cs)	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -40,7 +40,10 @@
         /// <param name="readRingtoetsPipingSurfaceLines">The imported surface lines.</param>
         /// <param name="sourceFilePath">The source path from where the surface lines were imported from.</param>
         /// <returns>An <see cref="IEnumerable{IObservable}"/> of updated instances.</returns>
-        /// <exception cref="ArgumentNullException">Thrown when any of the input parameters is <c>null</c></exception>
+        /// <exception cref="ArgumentNullException">Thrown when any of the input parameters is <c>null</c>.</exception>
+        /// <exception cref="RingtoetsPipingSurfaceLineUpdateException">Thrown when applying the strategy has failed. The 
+        /// <see cref="RingtoetsPipingSurfaceLineUpdateException.InnerException"/> is set with a more detailed explanation
+        /// of why the exception occurs.</exception>
         IEnumerable<IObservable> UpdateSurfaceLinesWithImportedData(
             ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine> targetCollection,
             IEnumerable<RingtoetsPipingSurfaceLine> readRingtoetsPipingSurfaceLines,
Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Importers/RingtoetsPipingSurfaceLineUpdateException.cs
===================================================================
diff -u
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Importers/RingtoetsPipingSurfaceLineUpdateException.cs	(revision 0)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Importers/RingtoetsPipingSurfaceLineUpdateException.cs	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -0,0 +1,57 @@
+// 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.Runtime.Serialization;
+
+namespace Ringtoets.Piping.IO.Importers
+{
+    /// <summary>
+    /// Exception that is thrown when applying the surface line update strategy has failed.
+    /// </summary>
+    [Serializable]
+    public class RingtoetsPipingSurfaceLineUpdateException : Exception
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RingtoetsPipingSurfaceLineUpdateException"/> class.
+        /// </summary>
+        public RingtoetsPipingSurfaceLineUpdateException() {}
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RingtoetsPipingSurfaceLineUpdateException"/> class
+        /// with a specified error message.
+        /// </summary>
+        /// <param name="message">The error message that explains the reason for the exception.</param>
+        public RingtoetsPipingSurfaceLineUpdateException(string message) : base(message) {}
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RingtoetsPipingSurfaceLineUpdateException"/> class
+        /// with a specified error message and a reference to the inner exception that is
+        /// the cause of this exception.
+        /// </summary>
+        /// <param name="message">The error message that explains the reason for the exception.</param>
+        /// <param name="inner">The exception that is the cause of the current exception, 
+        /// or a null reference if no inner exception is specified.</param>
+        public RingtoetsPipingSurfaceLineUpdateException(string message, Exception inner) : base(message, inner) {}
+
+        protected RingtoetsPipingSurfaceLineUpdateException(SerializationInfo info, StreamingContext context) : base(info, context) {}
+    }
+}
\ No newline at end of file
Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Ringtoets.Piping.IO.csproj
===================================================================
diff -u -r3793f0710b624c5e9896dd9e8ec91232e5584b23 -r0122d4ac58ee6f7be4ff804db1f6c65e88ce4562
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Ringtoets.Piping.IO.csproj	(.../Ringtoets.Piping.IO.csproj)	(revision 3793f0710b624c5e9896dd9e8ec91232e5584b23)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Ringtoets.Piping.IO.csproj	(.../Ringtoets.Piping.IO.csproj)	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -56,6 +56,7 @@
     <Compile Include="Importers\IStochasticSoilModelChangeHandler.cs" />
     <Compile Include="Importers\IStochasticSoilModelUpdateModelStrategy.cs" />
     <Compile Include="Importers\ISurfaceLineUpdateSurfaceLineStrategy.cs" />
+    <Compile Include="Importers\RingtoetsPipingSurfaceLineUpdateException.cs" />
     <Compile Include="Importers\StochasticSoilModelImporter.cs" />
     <Compile Include="Importers\StochasticSoilModelUpdateException.cs" />
     <Compile Include="Readers\PipingCalculationGroupReader.cs" />
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/RingtoetsPipingSurfaceLineUpdateStrategy.cs
===================================================================
diff -u -r85e72b5765dd231d4d4a4ea6c51431d169a0fb72 -r0122d4ac58ee6f7be4ff804db1f6c65e88ce4562
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/RingtoetsPipingSurfaceLineUpdateStrategy.cs	(.../RingtoetsPipingSurfaceLineUpdateStrategy.cs)	(revision 85e72b5765dd231d4d4a4ea6c51431d169a0fb72)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/RingtoetsPipingSurfaceLineUpdateStrategy.cs	(.../RingtoetsPipingSurfaceLineUpdateStrategy.cs)	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -26,6 +26,7 @@
 using Core.Common.Utils;
 using Ringtoets.Piping.Data;
 using Ringtoets.Piping.IO.Importers;
+using Ringtoets.Piping.Plugin.Properties;
 using Ringtoets.Piping.Primitives;
 using Ringtoets.Piping.Service;
 
@@ -39,7 +40,7 @@
     /// </summary>
     public class RingtoetsPipingSurfaceLineUpdateDataStrategy : ISurfaceLineUpdateSurfaceLineStrategy
     {
-        private PipingFailureMechanism failureMechanism;
+        private readonly PipingFailureMechanism failureMechanism;
 
         /// <summary>
         /// Creates a new instance of <see cref="RingtoetsPipingSurfaceLineUpdateDataStrategy"/>.
@@ -72,7 +73,15 @@
                 throw new ArgumentNullException(nameof(sourceFilePath));
             }
 
-            return ModifySurfaceLineCollection(targetCollection, readRingtoetsPipingSurfaceLines, sourceFilePath);
+            try
+            {
+                return ModifySurfaceLineCollection(targetCollection, readRingtoetsPipingSurfaceLines, sourceFilePath);
+            }
+            catch (InvalidOperationException e)
+            {
+                var message = Resources.RingtoetsPipingSurfaceLineUpdateDataStrategy_UpdateSurfaceLinesWithImportedData_Update_of_RingtoetsPipingSurfaceLine_has_failed;
+                throw new RingtoetsPipingSurfaceLineUpdateException(message, e);
+            }
         }
 
         private IEnumerable<IObservable> ModifySurfaceLineCollection(ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine> existingCollection,
@@ -89,6 +98,7 @@
             {
                 affectedObjects.Add(existingCollection);
             }
+            affectedObjects.AddRange(UpdateSurfaceLines(updatedSurfaceLines, readSurfaceLineList));
             affectedObjects.AddRange(RemoveSurfaceLines(removedSurfaceLines));
 
             existingCollection.Clear();
@@ -135,8 +145,27 @@
 
         #endregion
 
+        #region Updating surface line helpers
+
+        private IEnumerable<IObservable> UpdateSurfaceLines(IEnumerable<RingtoetsPipingSurfaceLine> updatedSurfaceLines,
+                                                            IList<RingtoetsPipingSurfaceLine> readSurfaceLines)
+        {
+            var affectedObjects = new List<IObservable>();
+
+            foreach (RingtoetsPipingSurfaceLine updatedSurfaceLine in updatedSurfaceLines)
+            {
+                RingtoetsPipingSurfaceLine matchingSurfaceLine = readSurfaceLines.Single(sl => sl.Name == updatedSurfaceLine.Name);
+                updatedSurfaceLine.Update(matchingSurfaceLine);
+                affectedObjects.Add(updatedSurfaceLine);
+            }
+
+            return affectedObjects;
+        }
+
+        #endregion
+
         /// <summary>
-        /// Class fpr comparing <see cref="RingtoetsPipingSurfaceLine"/> by only the name.
+        /// Class for comparing <see cref="RingtoetsPipingSurfaceLine"/> by only the name.
         /// </summary>
         private class RingtoetsPipingSurfaceLineNameEqualityComparer : IEqualityComparer<RingtoetsPipingSurfaceLine>
         {
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/Properties/Resources.Designer.cs
===================================================================
diff -u -r6ad658313ed97085f5a2653f9e769b77f3b94d80 -r0122d4ac58ee6f7be4ff804db1f6c65e88ce4562
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision 6ad658313ed97085f5a2653f9e769b77f3b94d80)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -364,6 +364,16 @@
         }
         
         /// <summary>
+        ///   Looks up a localized string similar to Het bijwerken van de profielschematisaties is mislukt..
+        /// </summary>
+        public static string RingtoetsPipingSurfaceLineUpdateDataStrategy_UpdateSurfaceLinesWithImportedData_Update_of_RingtoetsPipingSurfaceLine_has_failed {
+            get {
+                return ResourceManager.GetString("RingtoetsPipingSurfaceLineUpdateDataStrategy_UpdateSurfaceLinesWithImportedData_U" +
+                        "pdate_of_RingtoetsPipingSurfaceLine_has_failed", resourceCulture);
+            }
+        }
+        
+        /// <summary>
         ///   Looks up a localized string similar to D-Soil Model bestand.
         /// </summary>
         public static string Soil_file_name {
Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/Properties/Resources.resx
===================================================================
diff -u -r6ad658313ed97085f5a2653f9e769b77f3b94d80 -r0122d4ac58ee6f7be4ff804db1f6c65e88ce4562
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/Properties/Resources.resx	(.../Resources.resx)	(revision 6ad658313ed97085f5a2653f9e769b77f3b94d80)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/Properties/Resources.resx	(.../Resources.resx)	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -219,4 +219,7 @@
   <data name="StochasticSoilModelChangeHandler_When_updating_StochasticSoilModel_definitions_assigned_to_calculations_output_will_be_cleared_confirm" xml:space="preserve">
     <value>Wanneer ondergrondschematisaties wijzigen als gevolg van het bijwerken, zullen de resultaten van berekeningen die deze ondergrondschematisaties worden verwijderd. Weet u zeker dat u wilt doorgaan?</value>
   </data>
+  <data name="RingtoetsPipingSurfaceLineUpdateDataStrategy_UpdateSurfaceLinesWithImportedData_Update_of_RingtoetsPipingSurfaceLine_has_failed" xml:space="preserve">
+    <value>Het bijwerken van de profielschematisaties is mislukt.</value>
+  </data>
 </root>
\ No newline at end of file
Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Importers/RingtoetsPipingSurfaceLineUpdateExceptionTest.cs
===================================================================
diff -u
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Importers/RingtoetsPipingSurfaceLineUpdateExceptionTest.cs	(revision 0)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Importers/RingtoetsPipingSurfaceLineUpdateExceptionTest.cs	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -0,0 +1,32 @@
+// 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 Core.Common.TestUtil;
+using NUnit.Framework;
+using Ringtoets.Piping.IO.Importers;
+
+namespace Ringtoets.Piping.IO.Test.Importers
+{
+    [TestFixture]
+    public class RingtoetsPipingSurfaceLineUpdateExceptionTest : 
+        CustomExceptionDesignGuidelinesTestFixture<RingtoetsPipingSurfaceLineUpdateException, Exception> {}
+}
Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Ringtoets.Piping.IO.Test.csproj
===================================================================
diff -u -r0e8f4dc487699dda631e50c389624f191f8e946d -r0122d4ac58ee6f7be4ff804db1f6c65e88ce4562
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Ringtoets.Piping.IO.Test.csproj	(.../Ringtoets.Piping.IO.Test.csproj)	(revision 0e8f4dc487699dda631e50c389624f191f8e946d)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Ringtoets.Piping.IO.Test.csproj	(.../Ringtoets.Piping.IO.Test.csproj)	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -73,6 +73,7 @@
     <Compile Include="Builders\SoilDatabaseQueryBuilderTest.cs" />
     <Compile Include="Exceptions\StochasticSoilProfileReadExceptionTest.cs" />
     <Compile Include="Exporters\CalculationGroupWriterTest.cs" />
+    <Compile Include="Importers\RingtoetsPipingSurfaceLineUpdateExceptionTest.cs" />
     <Compile Include="Importers\StochasticSoilModelUpdateExceptionTest.cs" />
     <Compile Include="Readers\PipingCalculationGroupReaderTest.cs" />
     <Compile Include="Readers\ReadPipingCalculationGroupTest.cs" />
Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/RingtoetsPipingSurfaceLineUpdateDataStrategyTest.cs
===================================================================
diff -u -r85e72b5765dd231d4d4a4ea6c51431d169a0fb72 -r0122d4ac58ee6f7be4ff804db1f6c65e88ce4562
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/RingtoetsPipingSurfaceLineUpdateDataStrategyTest.cs	(.../RingtoetsPipingSurfaceLineUpdateDataStrategyTest.cs)	(revision 85e72b5765dd231d4d4a4ea6c51431d169a0fb72)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/RingtoetsPipingSurfaceLineUpdateDataStrategyTest.cs	(.../RingtoetsPipingSurfaceLineUpdateDataStrategyTest.cs)	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -23,6 +23,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using Core.Common.Base;
+using Core.Common.Base.Geometry;
 using NUnit.Framework;
 using Ringtoets.Piping.Data;
 using Ringtoets.Piping.IO.Importers;
@@ -36,7 +37,6 @@
     {
         private const string sourceFilePath = "some/path";
 
-
         [Test]
         public void Constructor_FailureMechanismNull_ThrowsArgumentNullException()
         {
@@ -89,7 +89,7 @@
         }
 
         [Test]
-        public void UpdatSurfaceLinesWithImportedData_SourceFilePathNull_ThrowsArgumentNullException()
+        public void UpdateSurfaceLinesWithImportedData_SourceFilePathNull_ThrowsArgumentNullException()
         {
             // Setup
             var strategy = new RingtoetsPipingSurfaceLineUpdateDataStrategy(new PipingFailureMechanism());
@@ -105,7 +105,7 @@
         }
 
         [Test]
-        public void UpdatSurfaceLinesWithImportedData_ReadSurfaceLinesNotInTargetCollection_NewSurfaceLinesAdded()
+        public void UpdateSurfaceLinesWithImportedData_ReadSurfaceLinesNotInTargetCollection_NewSurfaceLinesAdded()
         {
             // Setup
             var importedSurfaceLines = new[]
@@ -130,13 +130,52 @@
 
             // Assert
             CollectionAssert.AreEqual(importedSurfaceLines, targetCollection);
-            CollectionAssert.AreEqual(new []
+            CollectionAssert.AreEqual(new[]
             {
                 targetCollection
             }, affectedObjects);
         }
-        
+
         [Test]
+        public void UpdateSurfaceLinesWithImportedData_WithCurrentModelsAndImportedMultipleLinesWithSameNames_ThrowsRingtoetsPipingSurfaceLineUpdateException()
+        {
+            // Setup
+            const string duplicateName = "Duplicate name it is";
+            var targetCollection = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
+            targetCollection.AddRange(new[]
+            {
+                new RingtoetsPipingSurfaceLine
+                {
+                    Name = duplicateName
+                }
+            }, sourceFilePath);
+
+            RingtoetsPipingSurfaceLine[] importedSurfaceLines =
+            {
+                new RingtoetsPipingSurfaceLine
+                {
+                    Name = duplicateName
+                },
+                new RingtoetsPipingSurfaceLine
+                {
+                    Name = duplicateName
+                }
+            };
+
+            var strategy = new RingtoetsPipingSurfaceLineUpdateDataStrategy(new PipingFailureMechanism());
+
+            // Call
+            TestDelegate call = () => strategy.UpdateSurfaceLinesWithImportedData(targetCollection,
+                                                                                  importedSurfaceLines,
+                                                                                  sourceFilePath);
+
+            // Assert
+            var exception = Assert.Throws<RingtoetsPipingSurfaceLineUpdateException>(call);
+            Assert.AreEqual("Het bijwerken van de profielschematisaties is mislukt.", exception.Message);
+            Assert.IsInstanceOf<InvalidOperationException>(exception.InnerException);
+        }
+
+        [Test]
         public void UpdateSurfaceLinesWithImportedData_WithCurrentModelsAndImportedDataEmpty_SurfaceLinesRemoved()
         {
             // Setup
@@ -158,10 +197,57 @@
 
             // Assert
             CollectionAssert.IsEmpty(targetCollection);
-            CollectionAssert.AreEqual(new []
+            CollectionAssert.AreEqual(new[]
             {
                 targetCollection
             }, affectedObjects);
         }
+
+        [Test]
+        public void UpdateSurfaceLinesWithImportedData_WithCurrentLinesAndImportedDataHasSameName_UpdatesTargetCollection()
+        {
+            // Setup
+            var targetSurfaceLine = new RingtoetsPipingSurfaceLine
+            {
+                Name = "Name A"
+            };
+            var targetCollection = new ObservableCollectionWithSourcePath<RingtoetsPipingSurfaceLine>();
+            targetCollection.AddRange(new[]
+            {
+                targetSurfaceLine
+            }, sourceFilePath);
+
+            Point3D[] expectedGeometry =
+            {
+                new Point3D(0, 1, 2),
+                new Point3D(3, 4, 5),
+                new Point3D(6, 7, 8)
+            };
+            var readSurfaceLine = new RingtoetsPipingSurfaceLine
+            {
+                Name = "Name A"
+            };
+            readSurfaceLine.SetGeometry(expectedGeometry);
+            var readSurfacelines = new[]
+            {
+                readSurfaceLine
+            };
+
+            var strategy = new RingtoetsPipingSurfaceLineUpdateDataStrategy(new PipingFailureMechanism());
+
+            // Call
+            IEnumerable<IObservable> affectedObjects = strategy.UpdateSurfaceLinesWithImportedData(targetCollection,
+                                                                                                   readSurfacelines,
+                                                                                                   sourceFilePath);
+
+            // Assert
+            Assert.AreEqual(1, targetCollection.Count);
+            Assert.AreSame(targetSurfaceLine, targetCollection[0]);
+            CollectionAssert.AreEqual(expectedGeometry, targetSurfaceLine.Points);
+            CollectionAssert.AreEqual(new[]
+            {
+                targetSurfaceLine
+            }, affectedObjects);
+        }
     }
 }
\ No newline at end of file
Index: Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/StochasticSoilModelUpdateDataStrategyTest.cs
===================================================================
diff -u -r6ad658313ed97085f5a2653f9e769b77f3b94d80 -r0122d4ac58ee6f7be4ff804db1f6c65e88ce4562
--- Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/StochasticSoilModelUpdateDataStrategyTest.cs	(.../StochasticSoilModelUpdateDataStrategyTest.cs)	(revision 6ad658313ed97085f5a2653f9e769b77f3b94d80)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Plugin.Test/FileImporter/StochasticSoilModelUpdateDataStrategyTest.cs	(.../StochasticSoilModelUpdateDataStrategyTest.cs)	(revision 0122d4ac58ee6f7be4ff804db1f6c65e88ce4562)
@@ -102,7 +102,7 @@
         }
 
         [Test]
-        public void UpdateModelWithImportedData_WithCurrentModelsAndImportedMultipleModelsWithSameName_ThrowsInvalidOperationException()
+        public void UpdateModelWithImportedData_WithCurrentModelsAndImportedMultipleModelsWithSameName_ThrowsStochasticSoilModelUpdateException()
         {
             // Setup
             const string nonUniqueName = "non-unique name";