Index: Ringtoets/Migration/src/Ringtoets.Migration.Core/EmbeddedResources/Migration_17.3_18.1.sql
===================================================================
diff -u -r2ef23cfcb32102f57f0e225f9aa9f76fb84292ca -r19382b3670a64bb81d862b8a423d2d4ed1736420
--- Ringtoets/Migration/src/Ringtoets.Migration.Core/EmbeddedResources/Migration_17.3_18.1.sql	(.../Migration_17.3_18.1.sql)	(revision 2ef23cfcb32102f57f0e225f9aa9f76fb84292ca)
+++ Ringtoets/Migration/src/Ringtoets.Migration.Core/EmbeddedResources/Migration_17.3_18.1.sql	(.../Migration_17.3_18.1.sql)	(revision 19382b3670a64bb81d862b8a423d2d4ed1736420)
@@ -771,7 +771,11 @@
 	[Name],
 	[ReferenceLineIntersectionX],
 	[ReferenceLineIntersectionY],
-	[PointsXml],
+	REPLACE(
+		REPLACE(PointsXml, ' xmlns="http://schemas.datacontract.org/2004/07/Application.Ringtoets.Storage.Serializers"', ''), 
+		'Point3DXmlSerializer.SerializablePoint3D',
+		'SerializablePoint3D'
+	),
 	[Order]
 FROM [SOURCEPROJECT].SurfaceLineEntity;
 INSERT INTO TechnicalInnovationSectionResultEntity (
Index: Ringtoets/Migration/test/Ringtoets.Migration.Integration.Test/MigrationTo181IntegrationTest.cs
===================================================================
diff -u -r2ef23cfcb32102f57f0e225f9aa9f76fb84292ca -r19382b3670a64bb81d862b8a423d2d4ed1736420
--- Ringtoets/Migration/test/Ringtoets.Migration.Integration.Test/MigrationTo181IntegrationTest.cs	(.../MigrationTo181IntegrationTest.cs)	(revision 2ef23cfcb32102f57f0e225f9aa9f76fb84292ca)
+++ Ringtoets/Migration/test/Ringtoets.Migration.Integration.Test/MigrationTo181IntegrationTest.cs	(.../MigrationTo181IntegrationTest.cs)	(revision 19382b3670a64bb81d862b8a423d2d4ed1736420)
@@ -127,6 +127,7 @@
 
                     MigratedSerializedDataTestHelper.AssertSerializedMacroStabilityInwardsOutput(reader);
                     MigratedSerializedDataTestHelper.AssertSerializedDikeProfile(reader);
+                    MigratedSerializedDataTestHelper.AssertSerializedSurfaceLine(reader);
                 }
 
                 AssertLogDatabase(logFilePath);
@@ -979,10 +980,12 @@
             /// </list></exception>
             public static void AssertSerializedMacroStabilityInwardsOutput(MigratedDatabaseReader reader)
             {
+                const string outputEntity = "MacroStabilityInwardsCalculationOutputEntity";
+
                 string validateSlidingCurves =
                     "SELECT " +
                     "COUNT() = 0 " +
-                    "FROM MacroStabilityInwardsCalculationOutputEntity " +
+                    $"FROM {outputEntity} " +
                     "WHERE LIKE('%MacroStabilityInwardsSliceXmlSerializer%', SlidingCurveSliceXML) " +
                     $"OR LIKE('%{oldNamespace}%', SlidingCurveSliceXML)";
 
@@ -991,7 +994,7 @@
                 string validateTangentLines =
                     "SELECT " +
                     "COUNT() = 0 " +
-                    "FROM MacroStabilityInwardsCalculationOutputEntity " +
+                    $"FROM {outputEntity} " +
                     "WHERE LIKE('%TangentLinesXmlSerializer%', SlipPlaneTangentLinesXml) " +
                     $"OR LIKE('%{oldNamespace}%', SlipPlaneTangentLinesXml)";
 
@@ -1018,6 +1021,27 @@
 
                 reader.AssertReturnedDataIsValid(validateDikeGeometry);
             }
+
+            /// <summary>
+            /// Asserts the migrated serialized data related to the surface lines.
+            /// </summary>
+            /// <param name="reader">The reader to read the migrated database.</param>
+            /// <exception cref="AssertionException">Thrown when:
+            /// <list type="bullet">
+            /// <item>The namespace is still present.</item>
+            /// <item>The class name of the serialized data is still present.</item>
+            /// </list></exception>
+            public static void AssertSerializedSurfaceLine(MigratedDatabaseReader reader)
+            {
+                string validateSurfaceLinePoints =
+                    "SELECT " +
+                    "COUNT() = 0 " +
+                    "FROM SurfaceLineEntity " +
+                    "WHERE LIKE('%Point3DXmlSerializer%', PointsXml) " +
+                    $"OR LIKE('%{oldNamespace}%', PointsXml)";
+
+                reader.AssertReturnedDataIsValid(validateSurfaceLinePoints);
+            }
         }
 
         #endregion