Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Forms/Views/ClosingStructuresFailureMechanismResultView.cs
===================================================================
diff -u -r08d327d4e68f5c4415c0e9239e437f052a068cc7 -rb72777768ad6c20931165fac4d8286e7dedb999d
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Forms/Views/ClosingStructuresFailureMechanismResultView.cs	(.../ClosingStructuresFailureMechanismResultView.cs)	(revision 08d327d4e68f5c4415c0e9239e437f052a068cc7)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Forms/Views/ClosingStructuresFailureMechanismResultView.cs	(.../ClosingStructuresFailureMechanismResultView.cs)	(revision b72777768ad6c20931165fac4d8286e7dedb999d)
@@ -136,8 +136,8 @@
         {
             if (eventArgs.ColumnIndex > SimpleAssessmentColumnIndex)
             {
-                var simpleAssessmentResult = (SimpleAssessmentResultType) DataGridViewControl.GetCell(eventArgs.RowIndex,
-                                                                                                      SimpleAssessmentColumnIndex).Value;
+                SimpleAssessmentResultType simpleAssessmentResult =
+                    ((ClosingStructuresFailureMechanismSectionResultRow) GetDataAtRow(eventArgs.RowIndex)).SimpleAssessmentResult;
                 if (FailureMechanismResultViewHelper.SimpleAssessmentIsSufficient(simpleAssessmentResult))
                 {
                     DataGridViewControl.DisableCell(eventArgs.RowIndex, eventArgs.ColumnIndex);