diff --git a/ApplicationCode/Application/RiaApplication.cpp b/ApplicationCode/Application/RiaApplication.cpp
index f9302bf28c..6278ddb2c4 100644
--- a/ApplicationCode/Application/RiaApplication.cpp
+++ b/ApplicationCode/Application/RiaApplication.cpp
@@ -71,7 +71,6 @@
 #include "RimSummaryCaseMainCollection.h"
 #include "RimSummaryCrossPlotCollection.h"
 #include "RimSummaryPlot.h"
-#include "RimSummaryPlotCollection.h"
 #include "RimTextAnnotation.h"
 #include "RimTextAnnotationInView.h"
 #include "RimViewLinker.h"
@@ -499,6 +498,12 @@ bool RiaApplication::loadProject( const QString&      projectFileName,
         }
     }
 
+    {
+        RimMainPlotCollection* mainPlotColl = m_project->mainPlotCollection();
+
+        mainPlotColl->ensureCalculationIdsAreAssigned();
+    }
+
     for ( RimOilField* oilField : m_project->oilFields )
     {
         if ( oilField == nullptr ) continue;
diff --git a/ApplicationCode/ProjectDataModel/RimMainPlotCollection.cpp b/ApplicationCode/ProjectDataModel/RimMainPlotCollection.cpp
index 5037295d71..619ffcae10 100644
--- a/ApplicationCode/ProjectDataModel/RimMainPlotCollection.cpp
+++ b/ApplicationCode/ProjectDataModel/RimMainPlotCollection.cpp
@@ -28,6 +28,7 @@
 #include "RimProject.h"
 #include "RimRftPlotCollection.h"
 #include "RimSaturationPressurePlotCollection.h"
+#include "RimSummaryAddress.h"
 #include "RimSummaryCrossPlotCollection.h"
 #include "RimSummaryPlotCollection.h"
 #include "RimViewWindow.h"
@@ -307,3 +308,17 @@ void RimMainPlotCollection::ensureDefaultFlowPlotsAreCreated()
 {
     m_flowPlotCollection()->ensureDefaultFlowPlotsAreCreated();
 }
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimMainPlotCollection::ensureCalculationIdsAreAssigned()
+{
+    std::vector<RimSummaryAddress*> allAddresses;
+    this->descendantsIncludingThisOfType( allAddresses );
+
+    for ( RimSummaryAddress* adr : allAddresses )
+    {
+        adr->ensureIdIsAssigned();
+    }
+}
diff --git a/ApplicationCode/ProjectDataModel/RimMainPlotCollection.h b/ApplicationCode/ProjectDataModel/RimMainPlotCollection.h
index 3e9a03fa07..9fc47cfce6 100644
--- a/ApplicationCode/ProjectDataModel/RimMainPlotCollection.h
+++ b/ApplicationCode/ProjectDataModel/RimMainPlotCollection.h
@@ -67,6 +67,7 @@ public:
     void updatePlotsWithCompletions();
     void deleteAllCachedData();
     void ensureDefaultFlowPlotsAreCreated();
+    void ensureCalculationIdsAreAssigned();
 
 private:
     // Overridden PDM methods
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimSummaryAddress.cpp b/ApplicationCode/ProjectDataModel/Summary/RimSummaryAddress.cpp
index 53e85fe058..acc0853aa7 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimSummaryAddress.cpp
+++ b/ApplicationCode/ProjectDataModel/Summary/RimSummaryAddress.cpp
@@ -18,6 +18,12 @@
 
 #include "RimSummaryAddress.h"
 
+#include "RiaApplication.h"
+
+#include "RimProject.h"
+#include "RimSummaryCalculation.h"
+#include "RimSummaryCalculationCollection.h"
+
 namespace caf
 {
 template <>
@@ -126,3 +132,24 @@ RifEclipseSummaryAddress RimSummaryAddress::address()
                                      m_isErrorResult,
                                      m_calculationId );
 }
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimSummaryAddress::ensureIdIsAssigned()
+{
+    if ( m_category == RifEclipseSummaryAddress::SUMMARY_CALCULATED && m_calculationId == -1 )
+    {
+        RimSummaryCalculationCollection* calcColl = RiaApplication::instance()->project()->calculationCollection();
+
+        for ( const RimSummaryCalculation* c : calcColl->calculations() )
+        {
+            QString description = c->description();
+
+            if ( description == m_quantityName )
+            {
+                m_calculationId = c->id();
+            }
+        }
+    }
+}
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimSummaryAddress.h b/ApplicationCode/ProjectDataModel/Summary/RimSummaryAddress.h
index 549e8dd40f..d889c637f6 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimSummaryAddress.h
+++ b/ApplicationCode/ProjectDataModel/Summary/RimSummaryAddress.h
@@ -42,12 +42,13 @@ class RimSummaryAddress : public caf::PdmObject
 
 public:
     RimSummaryAddress();
-    ;
     ~RimSummaryAddress() override;
 
     void                     setAddress( const RifEclipseSummaryAddress& addr );
     RifEclipseSummaryAddress address();
 
+    void ensureIdIsAssigned();
+
 private:
     caf::PdmField<caf::AppEnum<RifEclipseSummaryAddress::SummaryVarCategory>> m_category;
     caf::PdmField<QString>                                                    m_quantityName;