Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PropertyClasses/OvertoppingRateOutputProperties.cs
===================================================================
diff -u -r2e944cbf52d124fd501ed4ed8e991aa50299cc69 -ra163c5f082694baf5cd491ea36baf6fb040fe868
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PropertyClasses/OvertoppingRateOutputProperties.cs	(.../OvertoppingRateOutputProperties.cs)	(revision 2e944cbf52d124fd501ed4ed8e991aa50299cc69)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Forms/PropertyClasses/OvertoppingRateOutputProperties.cs	(.../OvertoppingRateOutputProperties.cs)	(revision a163c5f082694baf5cd491ea36baf6fb040fe868)
@@ -189,9 +189,9 @@
                     return new TopLevelFaultTreeIllustrationPointProperties[0];
                 }
 
-                bool areClosingSituationsSame = data.GeneralResult
-                                                    .TopLevelIllustrationPoints
-                                                    .HasDuplicates(p => p.ClosingSituation);
+                bool areClosingSituationsSame = !data.GeneralResult
+                                                     .TopLevelIllustrationPoints
+                                                     .HasMultipleUniqueValues(p => p.ClosingSituation);
 
                 return data.GeneralResult
                            .TopLevelIllustrationPoints