Index: Ringtoets/Integration/src/Ringtoets.Integration.IO/Creators/AggregatedSerializableFailureMechanismCreator.cs
===================================================================
diff -u -r4b7ea112093d1c9c952fd0b56fe78ba13b4e03e8 -rbaec4bec0cf9bc8516b945be1939c1bd4a10f53b
--- Ringtoets/Integration/src/Ringtoets.Integration.IO/Creators/AggregatedSerializableFailureMechanismCreator.cs	(.../AggregatedSerializableFailureMechanismCreator.cs)	(revision 4b7ea112093d1c9c952fd0b56fe78ba13b4e03e8)
+++ Ringtoets/Integration/src/Ringtoets.Integration.IO/Creators/AggregatedSerializableFailureMechanismCreator.cs	(.../AggregatedSerializableFailureMechanismCreator.cs)	(revision baec4bec0cf9bc8516b945be1939c1bd4a10f53b)
@@ -167,6 +167,18 @@
                 return AggregatedSerializableFailureMechanismSectionAssemblyCreator.Create(idGenerator, serializableCollection, serializableFailureMechanism, resultWithoutDetailedAssembly);
             }
 
+            var resultWithCombinedAssembly = failureMechanismSectionAssemblyResult as ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedResult;
+            if (resultWithCombinedAssembly != null)
+            {
+                return AggregatedSerializableFailureMechanismSectionAssemblyCreator.Create(idGenerator, serializableCollection, serializableFailureMechanism, resultWithCombinedAssembly);
+            }
+
+            var resultWithCombinedProbabilityAssembly = failureMechanismSectionAssemblyResult as ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedProbabilityResult;
+            if (resultWithCombinedProbabilityAssembly != null)
+            {
+                return AggregatedSerializableFailureMechanismSectionAssemblyCreator.Create(idGenerator, serializableCollection, serializableFailureMechanism, resultWithCombinedProbabilityAssembly);
+            }
+
             throw new NotSupportedException($"{failureMechanismSectionAssemblyResult.GetType().Name} is not supported.");
         }
     }
Index: Ringtoets/Integration/test/Ringtoets.Integration.IO.Test/Creators/AggregatedSerializableFailureMechanismCreatorTest.cs
===================================================================
diff -u -r821ea9c9eada82e432462f9be0390dd5b45ffb29 -rbaec4bec0cf9bc8516b945be1939c1bd4a10f53b
--- Ringtoets/Integration/test/Ringtoets.Integration.IO.Test/Creators/AggregatedSerializableFailureMechanismCreatorTest.cs	(.../AggregatedSerializableFailureMechanismCreatorTest.cs)	(revision 821ea9c9eada82e432462f9be0390dd5b45ffb29)
+++ Ringtoets/Integration/test/Ringtoets.Integration.IO.Test/Creators/AggregatedSerializableFailureMechanismCreatorTest.cs	(.../AggregatedSerializableFailureMechanismCreatorTest.cs)	(revision baec4bec0cf9bc8516b945be1939c1bd4a10f53b)
@@ -385,6 +385,28 @@
                                                                                              actualSectionAssemblyResult.CombinedSectionResult);
         }
 
+        private static void AssertSectionAssemblyWithCombinedResult(ExportableAggregatedFailureMechanismSectionAssemblyResultBase expectedSectionAssemblyResult,
+                                                                    SerializableFailureMechanismSectionAssembly actualSectionAssemblyResult)
+        {
+            var expectedSectionAssemblyResultWithoutProbability = (ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedResult) expectedSectionAssemblyResult;
+            CollectionAssert.IsEmpty(actualSectionAssemblyResult.SectionResults);
+
+            SerializableFailureMechanismSectionAssemblyResultTestHelper.AssertAssemblyResult(expectedSectionAssemblyResultWithoutProbability.CombinedAssembly,
+                                                                                             SerializableAssessmentType.CombinedAssessment,
+                                                                                             actualSectionAssemblyResult.CombinedSectionResult);
+        }
+
+        private static void AssertSectionAssemblyWithCombinedProbabilityResult(ExportableAggregatedFailureMechanismSectionAssemblyResultBase expectedSectionAssemblyResult,
+                                                                               SerializableFailureMechanismSectionAssembly actualSectionAssemblyResult)
+        {
+            var expectedSectionAssemblyResultWithoutProbability = (ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedProbabilityResult) expectedSectionAssemblyResult;
+            CollectionAssert.IsEmpty(actualSectionAssemblyResult.SectionResults);
+
+            SerializableFailureMechanismSectionAssemblyResultTestHelper.AssertAssemblyResult(expectedSectionAssemblyResultWithoutProbability.CombinedAssembly,
+                                                                                             SerializableAssessmentType.CombinedAssessment,
+                                                                                             actualSectionAssemblyResult.CombinedSectionResult);
+        }
+
         private static SerializableTotalAssemblyResult CreateSerializableTotalAssembly(string totalAssemblyId)
         {
             return new SerializableTotalAssemblyResult(totalAssemblyId,
@@ -434,6 +456,28 @@
                                           new Action<ExportableAggregatedFailureMechanismSectionAssemblyResultBase,
                                               SerializableFailureMechanismSectionAssembly>(AssertSectionAssemblyResultsWithoutDetailedAssembly))
                 .SetName("SectionAssemblyResults without detailed assessment");
+
+            ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedResult[] failureMechanismSectionResultsWithCombinedAssembly =
+            {
+                CreateSectionResultWithCombinedAssembly(failureMechanismSections[0]),
+                CreateSectionResultWithCombinedAssembly(failureMechanismSections[1])
+            };
+            yield return new TestCaseData(failureMechanismSections,
+                                          failureMechanismSectionResultsWithCombinedAssembly,
+                                          new Action<ExportableAggregatedFailureMechanismSectionAssemblyResultBase,
+                                              SerializableFailureMechanismSectionAssembly>(AssertSectionAssemblyWithCombinedResult))
+                .SetName("SectionAssemblyResults with combined assessment");
+
+            ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedProbabilityResult[] failureMechanismSectionResultsWithCombinedProbabilityAssembly =
+            {
+                CreateSectionResultWithCombinedProbabilityAssembly(failureMechanismSections[0]),
+                CreateSectionResultWithCombinedProbabilityAssembly(failureMechanismSections[1])
+            };
+            yield return new TestCaseData(failureMechanismSections,
+                                          failureMechanismSectionResultsWithCombinedProbabilityAssembly,
+                                          new Action<ExportableAggregatedFailureMechanismSectionAssemblyResultBase,
+                                              SerializableFailureMechanismSectionAssembly>(AssertSectionAssemblyWithCombinedProbabilityResult))
+                .SetName("SectionAssemblyResults with combined probability assessment");
         }
 
         private static ExportableFailureMechanismSection CreateSection(int seed)
@@ -472,6 +516,16 @@
                                                                                                         CreateSectionAssemblyResult(12));
         }
 
+        private static ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedResult CreateSectionResultWithCombinedAssembly(ExportableFailureMechanismSection section)
+        {
+            return new ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedResult(section, CreateSectionAssemblyResult(10));
+        }
+
+        private static ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedProbabilityResult CreateSectionResultWithCombinedProbabilityAssembly(ExportableFailureMechanismSection section)
+        {
+            return new ExportableAggregatedFailureMechanismSectionAssemblyWithCombinedProbabilityResult(section, CreateSectionAssemblyResultWithProbability(10));
+        }
+
         private static ExportableSectionAssemblyResult CreateSectionAssemblyResult(int seed)
         {
             var random = new Random(seed);