diff --git a/ApplicationCode/ProjectDataModel/RimIdenticalGridCaseGroup.cpp b/ApplicationCode/ProjectDataModel/RimIdenticalGridCaseGroup.cpp
index 9be0877388..0a10f4586e 100644
--- a/ApplicationCode/ProjectDataModel/RimIdenticalGridCaseGroup.cpp
+++ b/ApplicationCode/ProjectDataModel/RimIdenticalGridCaseGroup.cpp
@@ -342,3 +342,22 @@ void RimIdenticalGridCaseGroup::clearActiveCellUnions()
     m_unionOfFractureActiveCells = new RigActiveCellInfo;
 }
 
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+bool RimIdenticalGridCaseGroup::contains(RimReservoir* reservoir) const
+{
+    CVF_ASSERT(reservoir);
+
+    for (size_t i = 0; i < caseCollection()->reservoirs().size(); i++)
+    {
+        RimReservoir* rimReservoir = caseCollection()->reservoirs()[i];
+        if (reservoir->caseName == reservoir->caseName)
+        {
+            return true;
+        }
+    }
+    
+    return false;
+}
+
diff --git a/ApplicationCode/ProjectDataModel/RimIdenticalGridCaseGroup.h b/ApplicationCode/ProjectDataModel/RimIdenticalGridCaseGroup.h
index a9a368ad75..6b05d6ec29 100644
--- a/ApplicationCode/ProjectDataModel/RimIdenticalGridCaseGroup.h
+++ b/ApplicationCode/ProjectDataModel/RimIdenticalGridCaseGroup.h
@@ -47,6 +47,7 @@ public:
 
     void addCase(RimReservoir* reservoir);
     void removeCase(RimReservoir* reservoir);
+    bool contains(RimReservoir* reservoir) const;
 
     RimStatisticalCalculation* createAndAppendStatisticalCalculation();
 
diff --git a/ApplicationCode/ProjectDataModel/RimUiTreeModelPdm.cpp b/ApplicationCode/ProjectDataModel/RimUiTreeModelPdm.cpp
index 35c24fc226..a59e911928 100644
--- a/ApplicationCode/ProjectDataModel/RimUiTreeModelPdm.cpp
+++ b/ApplicationCode/ProjectDataModel/RimUiTreeModelPdm.cpp
@@ -605,6 +605,11 @@ void RimUiTreeModelPdm::addObjects(const QModelIndex& itemIndex, caf::PdmObjectG
         {
             RimResultReservoir* rimResultReservoir = typedObjects[i];
 
+            if (gridCaseGroup->contains(rimResultReservoir))
+            {
+                continue;
+            }
+
             if (gridCaseGroup->mainGrid() == NULL)
             {
                 rimResultReservoir->openEclipseGridFile();