Index: Riskeer/Integration/src/Riskeer.Integration.IO/Factories/ExportableFailureMechanismSectionAssemblyResultFactory.cs
===================================================================
diff -u -r4f65751c794c7d4631e2c952be7e1a6a50334056 -rc97ad8e19de53a2c9288e5ed7625e2a5bdcde03e
--- Riskeer/Integration/src/Riskeer.Integration.IO/Factories/ExportableFailureMechanismSectionAssemblyResultFactory.cs	(.../ExportableFailureMechanismSectionAssemblyResultFactory.cs)	(revision 4f65751c794c7d4631e2c952be7e1a6a50334056)
+++ Riskeer/Integration/src/Riskeer.Integration.IO/Factories/ExportableFailureMechanismSectionAssemblyResultFactory.cs	(.../ExportableFailureMechanismSectionAssemblyResultFactory.cs)	(revision c97ad8e19de53a2c9288e5ed7625e2a5bdcde03e)
@@ -89,6 +89,11 @@
                 throw new ArgumentNullException(nameof(assemblyFunc));
             }
 
+            if (registry.Contains(sectionResult))
+            {
+                return registry.Get(sectionResult);
+            }
+
             FailureMechanismSectionAssemblyResultWrapper assemblyResultWrapper = assemblyFunc(
                 sectionResult, failureMechanism, assessmentSection);
             FailureMechanismSectionAssemblyResult assemblyResult = assemblyResultWrapper.AssemblyResult;
@@ -99,12 +104,15 @@
                 throw new AssemblyFactoryException("The assembly result is invalid and cannot be created.");
             }
 
-            return new ExportableFailureMechanismSectionAssemblyResult(
+            var exportableFailureMechanismSectionAssemblyResult = new ExportableFailureMechanismSectionAssemblyResult(
                 idGenerator.GetNewId(Resources.ExportableFailureMechanismSectionAssemblyResult_IdPrefix),
                 registry.Get(sectionResult.Section),
                 assemblyResult.SectionProbability, assemblyResult.FailureMechanismSectionAssemblyGroup,
                 ExportableAssemblyMethodConverter.ConvertTo(assemblyResultWrapper.AssemblyGroupMethod),
                 ExportableAssemblyMethodConverter.ConvertTo(assemblyResultWrapper.ProbabilityMethod));
+            
+            registry.Register(sectionResult, exportableFailureMechanismSectionAssemblyResult);
+            return exportableFailureMechanismSectionAssemblyResult;
         }
     }
 }
\ No newline at end of file
Index: Riskeer/Integration/test/Riskeer.Integration.IO.Test/Factories/ExportableFailureMechanismSectionAssemblyResultFactoryTest.cs
===================================================================
diff -u -r4f65751c794c7d4631e2c952be7e1a6a50334056 -rc97ad8e19de53a2c9288e5ed7625e2a5bdcde03e
--- Riskeer/Integration/test/Riskeer.Integration.IO.Test/Factories/ExportableFailureMechanismSectionAssemblyResultFactoryTest.cs	(.../ExportableFailureMechanismSectionAssemblyResultFactoryTest.cs)	(revision 4f65751c794c7d4631e2c952be7e1a6a50334056)
+++ Riskeer/Integration/test/Riskeer.Integration.IO.Test/Factories/ExportableFailureMechanismSectionAssemblyResultFactoryTest.cs	(.../ExportableFailureMechanismSectionAssemblyResultFactoryTest.cs)	(revision c97ad8e19de53a2c9288e5ed7625e2a5bdcde03e)
@@ -201,5 +201,39 @@
             ExportableFailureMechanismSectionAssemblyResultTestHelper.AssertExportableFailureMechanismSectionResult(
                 expectedSectionOutput, assemblyResult, registry.Get(failureMechanism.Sections.First()));
         }
+
+        [Test]
+        public void Create_SectionResultAlreadyRegistered_ReturnsRegisteredExportableFailureMechanismSectionAssemblyResult()
+        {
+            // Setup
+            var random = new Random(21);
+            var failureMechanism = new TestFailureMechanism();
+            FailureMechanismTestHelper.AddSections(failureMechanism, random.Next(2, 10));
+            var assessmentSection = new AssessmentSectionStub();
+
+            FailureMechanismSectionAssemblyResultWrapper expectedSectionOutput = FailureMechanismSectionAssemblyResultWrapperTestFactory.Create();
+
+            var idGenerator = new IdentifierGenerator();
+
+            var registry = new ExportableModelRegistry();
+            ExportableFailureMechanismSectionCollectionFactory.CreateExportableFailureMechanismSectionCollection(
+                new IdentifierGenerator(), registry, failureMechanism.Sections);
+
+            TestFailureMechanismSectionResult sectionResult = failureMechanism.SectionResults.First();
+            ExportableFailureMechanismSectionAssemblyResult assemblyResult1 = ExportableFailureMechanismSectionAssemblyResultFactory.Create(
+                idGenerator, registry, sectionResult, failureMechanism, assessmentSection,
+                (sr, fm, section) => expectedSectionOutput);
+
+            // Precondition
+            Assert.True(registry.Contains(sectionResult));
+
+            // Call
+            ExportableFailureMechanismSectionAssemblyResult assemblyResult2 = ExportableFailureMechanismSectionAssemblyResultFactory.Create(
+                idGenerator, registry, sectionResult, failureMechanism, assessmentSection,
+                (sr, fm, section) => expectedSectionOutput);
+
+            // Assert
+            Assert.AreSame(assemblyResult1, assemblyResult2);
+        }
     }
 }
\ No newline at end of file