Index: Riskeer/Integration/src/Riskeer.Integration.IO/Factories/ExportableFailureMechanismFactory.cs
===================================================================
diff -u -rd9119b8f4a74fb2a6f3ececeaea94f0e58513c52 -redf3f8db3d1d7abc06bb2a9a999885790e84e301
--- Riskeer/Integration/src/Riskeer.Integration.IO/Factories/ExportableFailureMechanismFactory.cs	(.../ExportableFailureMechanismFactory.cs)	(revision d9119b8f4a74fb2a6f3ececeaea94f0e58513c52)
+++ Riskeer/Integration/src/Riskeer.Integration.IO/Factories/ExportableFailureMechanismFactory.cs	(.../ExportableFailureMechanismFactory.cs)	(revision edf3f8db3d1d7abc06bb2a9a999885790e84e301)
@@ -63,7 +63,7 @@
             IdentifierGenerator idGenerator, ExportableModelRegistry registry, TFailureMechanism failureMechanism, IAssessmentSection assessmentSection,
             Func<TFailureMechanism, IAssessmentSection, FailureMechanismAssemblyResultWrapper> assembleFailureMechanismFunc,
             Func<TSectionResult, TFailureMechanism, IAssessmentSection, FailureMechanismSectionAssemblyResultWrapper> assembleFailureMechanismSectionFunc)
-            where TFailureMechanism : IFailureMechanism<TSectionResult>
+            where TFailureMechanism : class, IFailureMechanism<TSectionResult>
             where TSectionResult : FailureMechanismSectionResult
         {
             if (idGenerator == null)
@@ -188,7 +188,7 @@
         private static IEnumerable<ExportableFailureMechanismSectionAssemblyResult> CreateExportableFailureMechanismSectionResults<TFailureMechanism, TSectionResult>(
             IdentifierGenerator idGenerator, ExportableModelRegistry registry, TFailureMechanism failureMechanism, IAssessmentSection assessmentSection,
             Func<TSectionResult, TFailureMechanism, IAssessmentSection, FailureMechanismSectionAssemblyResultWrapper> assembleFailureMechanismSectionFunc)
-            where TFailureMechanism : IFailureMechanism<TSectionResult>
+            where TFailureMechanism : class, IFailureMechanism<TSectionResult>
             where TSectionResult : FailureMechanismSectionResult
         {
             return failureMechanism.SectionResults.Select(
Index: Riskeer/Integration/src/Riskeer.Integration.IO/Factories/ExportableFailureMechanismSectionAssemblyResultFactory.cs
===================================================================
diff -u -rd9119b8f4a74fb2a6f3ececeaea94f0e58513c52 -redf3f8db3d1d7abc06bb2a9a999885790e84e301
--- Riskeer/Integration/src/Riskeer.Integration.IO/Factories/ExportableFailureMechanismSectionAssemblyResultFactory.cs	(.../ExportableFailureMechanismSectionAssemblyResultFactory.cs)	(revision d9119b8f4a74fb2a6f3ececeaea94f0e58513c52)
+++ Riskeer/Integration/src/Riskeer.Integration.IO/Factories/ExportableFailureMechanismSectionAssemblyResultFactory.cs	(.../ExportableFailureMechanismSectionAssemblyResultFactory.cs)	(revision edf3f8db3d1d7abc06bb2a9a999885790e84e301)
@@ -57,7 +57,7 @@
             IdentifierGenerator idGenerator, ExportableModelRegistry registry,
             TSectionResult sectionResult, TFailureMechanism failureMechanism, IAssessmentSection assessmentSection,
             Func<TSectionResult, TFailureMechanism, IAssessmentSection, FailureMechanismSectionAssemblyResultWrapper> assemblyFunc)
-            where TFailureMechanism : IFailureMechanism<TSectionResult>
+            where TFailureMechanism : class, IFailureMechanism<TSectionResult>
             where TSectionResult : FailureMechanismSectionResult
         {
             if (idGenerator == null)