Index: Ringtoets/Common/src/Ringtoets.Common.Data/StructureCollection.cs
===================================================================
diff -u -r16a70f4e510b2667a5fcea88d6a34c410d18e168 -r7aa336d8c0d38c5af631d480da9c8c62a7f4e261
--- Ringtoets/Common/src/Ringtoets.Common.Data/StructureCollection.cs	(.../StructureCollection.cs)	(revision 16a70f4e510b2667a5fcea88d6a34c410d18e168)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/StructureCollection.cs	(.../StructureCollection.cs)	(revision 7aa336d8c0d38c5af631d480da9c8c62a7f4e261)
@@ -28,7 +28,7 @@
     /// A collection of <see cref="TStructure"/>. The ids of the <see cref="TStructure"/>
     /// are unique within the collection.
     /// </summary>
-    /// <typeparam name="TStructure">A structure.</typeparam>
+    /// <typeparam name="TStructure">The type of structure used in the collection.</typeparam>
     public class StructureCollection<TStructure> : ObservableUniqueItemCollectionWithSourcePath<TStructure>
         where TStructure : StructureBase
     {
Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/DikeProfiles/DikeProfileCollectionTest.cs
===================================================================
diff -u -ra588b2fbca3ea7073fa3aa30bde0bd59393ff994 -r7aa336d8c0d38c5af631d480da9c8c62a7f4e261
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/DikeProfiles/DikeProfileCollectionTest.cs	(.../DikeProfileCollectionTest.cs)	(revision a588b2fbca3ea7073fa3aa30bde0bd59393ff994)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/DikeProfiles/DikeProfileCollectionTest.cs	(.../DikeProfileCollectionTest.cs)	(revision 7aa336d8c0d38c5af631d480da9c8c62a7f4e261)
@@ -48,9 +48,8 @@
         protected override IEnumerable<DikeProfile> SingleNonUniqueElements()
         {
             const string someId = "Dike profile";
-            const string name = "Standard Dike Profile Name";
-            yield return new TestDikeProfile(name, someId);
-            yield return new TestDikeProfile(name, someId);
+            yield return new TestDikeProfile("Standard Dike Profile Name", someId);
+            yield return new TestDikeProfile("Other Dike Profile Name", someId);
         }
 
         protected override void AssertSingleNonUniqueElements(ArgumentException exception, IEnumerable<DikeProfile> itemsToAdd)
@@ -63,12 +62,11 @@
         {
             const string someId = "Dike profile";
             const string someotherId = "Other dike profile";
-            const string name = "Some Dike profile Name";
 
-            yield return new TestDikeProfile(name, someId);
-            yield return new TestDikeProfile(name, someId);
-            yield return new TestDikeProfile(name, someotherId);
-            yield return new TestDikeProfile(name, someotherId);
+            yield return new TestDikeProfile("Dike profile Name 1", someId);
+            yield return new TestDikeProfile("Dike profile Name 2", someId);
+            yield return new TestDikeProfile("Dike profile Name 3", someotherId);
+            yield return new TestDikeProfile("Dike profile Name 4", someotherId);
         }
 
         protected override void AssertMultipleNonUniqueElements(ArgumentException exception, IEnumerable<DikeProfile> itemsToAdd)
Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.IO/HeightStructuresImporter.cs
===================================================================
diff -u -r5f48c2f099a9ffd0e55b86aea0b356a226a1918f -r7aa336d8c0d38c5af631d480da9c8c62a7f4e261
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.IO/HeightStructuresImporter.cs	(.../HeightStructuresImporter.cs)	(revision 5f48c2f099a9ffd0e55b86aea0b356a226a1918f)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.IO/HeightStructuresImporter.cs	(.../HeightStructuresImporter.cs)	(revision 7aa336d8c0d38c5af631d480da9c8c62a7f4e261)
@@ -67,7 +67,7 @@
         {
             structureUpdateStrategy.UpdateStructuresWithImportedData(ImportTarget,
                                                                      CreateHeightStructures(structureLocations.ToList(),
-                                                                                            groupedStructureParameterRows).ToArray(),
+                                                                                            groupedStructureParameterRows),
                                                                      FilePath);
         }
 
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/RingtoetsPipingSurfaceLineCollectionTest.cs
===================================================================
diff -u -r33e8882a46b193286ebf3eeec73e81b7c5921489 -r7aa336d8c0d38c5af631d480da9c8c62a7f4e261
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/RingtoetsPipingSurfaceLineCollectionTest.cs	(.../RingtoetsPipingSurfaceLineCollectionTest.cs)	(revision 33e8882a46b193286ebf3eeec73e81b7c5921489)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/RingtoetsPipingSurfaceLineCollectionTest.cs	(.../RingtoetsPipingSurfaceLineCollectionTest.cs)	(revision 7aa336d8c0d38c5af631d480da9c8c62a7f4e261)
@@ -23,7 +23,6 @@
 using System.Collections.Generic;
 using System.Linq;
 using Core.Common.Base;
-using Core.Common.TestUtil;
 using NUnit.Framework;
 using Ringtoets.Common.Data.TestUtil;
 using Ringtoets.Piping.Primitives;
@@ -35,43 +34,6 @@
         CustomObservableUniqueItemCollectionWithSourcePathTestFixtureBase<
             ObservableUniqueItemCollectionWithSourcePath<RingtoetsPipingSurfaceLine>, RingtoetsPipingSurfaceLine>
     {
-        [Test]
-        public void AddRange_MultipleSurfaceLinesWithSameNames_ThrowsArgumentException()
-        {
-            // Setup
-            const string duplicateNameOne = "Duplicate name it is";
-            const string duplicateNameTwo = "Duplicate name again";
-            var surfaceLinesToAdd = new[]
-            {
-                new RingtoetsPipingSurfaceLine
-                {
-                    Name = duplicateNameOne
-                },
-                new RingtoetsPipingSurfaceLine
-                {
-                    Name = duplicateNameOne
-                },
-                new RingtoetsPipingSurfaceLine
-                {
-                    Name = duplicateNameTwo
-                },
-                new RingtoetsPipingSurfaceLine
-                {
-                    Name = duplicateNameTwo
-                }
-            };
-
-            var collection = new RingtoetsPipingSurfaceLineCollection();
-
-            // Call
-            TestDelegate call = () => collection.AddRange(surfaceLinesToAdd, "path");
-
-            // Assert
-            string message = $"Profielschematisaties moeten een unieke naam hebben. Gevonden dubbele elementen: {duplicateNameOne}, " +
-                             $"{duplicateNameTwo}.";
-            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentException>(call, message);
-        }
-
         protected override ObservableUniqueItemCollectionWithSourcePath<RingtoetsPipingSurfaceLine> CreateCollection()
         {
             return new RingtoetsPipingSurfaceLineCollection();
@@ -114,17 +76,16 @@
         {
             const string duplicateNameOne = "Duplicate name it is";
             const string duplicateNameTwo = "Duplicate name again";
-            yield return
-                new RingtoetsPipingSurfaceLine
-                {
-                    Name = duplicateNameOne
-                };
             yield return new RingtoetsPipingSurfaceLine
             {
                 Name = duplicateNameOne
             };
             yield return new RingtoetsPipingSurfaceLine
             {
+                Name = duplicateNameOne
+            };
+            yield return new RingtoetsPipingSurfaceLine
+            {
                 Name = duplicateNameTwo
             };
             yield return new RingtoetsPipingSurfaceLine