diff --git a/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCaseCollection.cpp b/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCaseCollection.cpp
index cb0f90c065..db4a85e91f 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCaseCollection.cpp
+++ b/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCaseCollection.cpp
@@ -83,15 +83,11 @@ RimDerivedEnsembleCaseCollection::RimDerivedEnsembleCaseCollection()
     m_fixedTimeStepIndex.uiCapability()->setUiEditorTypeName( caf::PdmUiTreeSelectionEditor::uiEditorTypeName() );
     m_fixedTimeStepIndex.uiCapability()->setUiLabelPosition( caf::PdmUiItemInfo::HIDDEN );
 
-    // Do not show child cases
-    uiCapability()->setUiTreeChildrenHidden( true );
-
-    // Do not store child cases to project file
-    m_cases.xmlCapability()->disableIO();
-
     setNameAsReadOnly();
     setName( "Delta Ensemble" );
 
+    setAsEnsemble( true );
+
     setDeletable( true );
 }
 
@@ -192,6 +188,7 @@ void RimDerivedEnsembleCaseCollection::updateDerivedEnsembleCases()
         derivedCase->createSummaryReaderInterface();
         derivedCase->setCaseRealizationParameters( crp );
         derivedCase->setInUse( true );
+        derivedCase->updateDisplayNameFromCases();
     }
 
     // If other derived ensembles are referring to this ensemble, update their cases as well
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimDerivedSummaryCase.cpp b/ApplicationCode/ProjectDataModel/Summary/RimDerivedSummaryCase.cpp
index 64fbc77b76..fdfed3fb15 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimDerivedSummaryCase.cpp
+++ b/ApplicationCode/ProjectDataModel/Summary/RimDerivedSummaryCase.cpp
@@ -24,6 +24,7 @@
 #include "RifDerivedEnsembleReader.h"
 
 #include "RimProject.h"
+#include "RimSummaryCaseCollection.h"
 #include "RimSummaryPlot.h"
 
 #include "cafPdmUiTreeSelectionEditor.h"
@@ -411,7 +412,17 @@ void RimDerivedSummaryCase::updateDisplayNameFromCases()
     else if ( m_operator() == DerivedSummaryOperator::DERIVED_OPERATOR_ADD )
         operatorText = "Sum";
 
-    QString name = operatorText + QString( "(%1 , %2)" ).arg( case1Name, case2Name );
+    QString name;
+    if ( case1Name == case2Name && m_summaryCase1->ensemble() && m_summaryCase2->ensemble() )
+    {
+        QString ensembleName1 = m_summaryCase1->ensemble()->name();
+        QString ensembleName2 = m_summaryCase2->ensemble()->name();
+        name                  = QString( "%1: %2 - %3" ).arg( case1Name ).arg( ensembleName1 ).arg( ensembleName2 );
+    }
+    else
+    {
+        name = operatorText + QString( "(%1 , %2)" ).arg( case1Name ).arg( case2Name );
+    }
 
     m_displayName = name;
 }
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimSummaryCase.cpp b/ApplicationCode/ProjectDataModel/Summary/RimSummaryCase.cpp
index b08186c267..2bd33b38e9 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimSummaryCase.cpp
+++ b/ApplicationCode/ProjectDataModel/Summary/RimSummaryCase.cpp
@@ -279,7 +279,7 @@ void RimSummaryCase::initAfterRead()
 //--------------------------------------------------------------------------------------------------
 QString RimSummaryCase::uniqueShortNameForCase( RimSummaryCase* summaryCase )
 {
-    QString                      ensembleName;
+    QString                      ensembleName = summaryCase->caseName();
     std::vector<RimSummaryCase*> summaryCases;
 
     auto ensemble = summaryCase->ensemble();
@@ -309,7 +309,7 @@ QString RimSummaryCase::uniqueShortNameForCase( RimSummaryCase* summaryCase )
         RiaFilePathTools::keyPathComponentsForEachFilePath( summaryFilePaths );
 
     QStringList keyFileComponents = keyFileComponentsForAllFiles[summaryCase->summaryHeaderFilename()];
-    CAF_ASSERT( !keyFileComponents.empty() );
+    if ( keyFileComponents.empty() ) return ensembleName;
 
     if ( !ensembleName.isEmpty() )
     {