Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/AssignUnassignCalculations.cs
===================================================================
diff -u -r83003ce3a26b35511212cc95936e8574bea66516 -r02670d8c9fceeaea5f829937a2eb269f3488c6b1
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/AssignUnassignCalculations.cs	(.../AssignUnassignCalculations.cs)	(revision 83003ce3a26b35511212cc95936e8574bea66516)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Utils/AssignUnassignCalculations.cs	(.../AssignUnassignCalculations.cs)	(revision 02670d8c9fceeaea5f829937a2eb269f3488c6b1)
@@ -53,7 +53,7 @@
             var sectionResultsArray = sectionResults.ToArray();
 
             FailureMechanismSection failureMechanismSectionContainingCalculation =
-                GrassCoverErosionInwardsHelper.FailureMechanismSectionForCalculation(sectionResultsArray, calculation);
+                GrassCoverErosionInwardsHelper.FailureMechanismSectionForCalculation(sectionResultsArray.Select(sr => sr.Section), calculation);
 
             UnassignCalculationInSectionResultsNotContainingCalculation(calculation, sectionResultsArray, failureMechanismSectionContainingCalculation);
 
@@ -88,7 +88,7 @@
             var sectionResultsArray = sectionResults.ToArray();
 
             Dictionary<string, IList<GrassCoverErosionInwardsCalculation>> calculationsPerSegmentName =
-                GrassCoverErosionInwardsHelper.CollectCalculationsPerSegment(sectionResultsArray, calculations);
+                GrassCoverErosionInwardsHelper.CollectCalculationsPerSegment(sectionResultsArray.Select(sr => sr.Section), calculations);
 
             UnassignCalculationInAllSectionResultsAndAssignSingleRemainingCalculation(sectionResultsArray, calculation, calculationsPerSegmentName);
         }