Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Parsers/DunesBoundaryConditionsCalculationParser.cs
===================================================================
diff -u -rc235d644419c9f398fd806f7dce2592f0974ac97 -rcaa069a8d2f118af9b92dc6db8c5c5bdbdc358fd
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Parsers/DunesBoundaryConditionsCalculationParser.cs	(.../DunesBoundaryConditionsCalculationParser.cs)	(revision c235d644419c9f398fd806f7dce2592f0974ac97)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Parsers/DunesBoundaryConditionsCalculationParser.cs	(.../DunesBoundaryConditionsCalculationParser.cs)	(revision caa069a8d2f118af9b92dc6db8c5c5bdbdc358fd)
@@ -42,8 +42,9 @@
                                         $"max(case when OutputVarId is 23 then d.Value end) {waterLevelColumnName} " +
                                         "FROM DesignPointResults as d " +
                                         $"WHERE SectionId = {sectionIdParameterName} " +
-                                        "AND OuterIterationId=(select max(OuterIterationId) FROM DesignPointResults) " +
-                                        "GROUP BY OuterIterationId;";
+                                        "GROUP BY OuterIterationId " +
+                                        "ORDER BY OuterIterationId DESC " +
+                                        "LIMIT 1;";
 
         /// <summary>
         /// Gets the output that was parsed from the output file.