Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Service/HeightStructuresCalculationService.cs
===================================================================
diff -u -r56ec7114c4c96eeee4a1bb16d0ecac2bb10a49b8 -rdc80ceebd52da19d841b46b5300695fd5c83e4a6
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Service/HeightStructuresCalculationService.cs	(.../HeightStructuresCalculationService.cs)	(revision 56ec7114c4c96eeee4a1bb16d0ecac2bb10a49b8)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Service/HeightStructuresCalculationService.cs	(.../HeightStructuresCalculationService.cs)	(revision dc80ceebd52da19d841b46b5300695fd5c83e4a6)
@@ -185,7 +185,6 @@
             else
             {
                 IEnumerable<ValidationRule> inputValidationRules = GetInputValidationRules(inputParameters);
-
                 foreach (var validationRule in inputValidationRules)
                 {
                     validationResults.AddRange(validationRule.Validate());
@@ -199,6 +198,7 @@
         {
             var validationRules = new List<ValidationRule>
             {
+                new UseBreakWaterRule(input),
                 new VariationCoefficientLogNormalDistributionRule(input.StormDuration,
                                                                   ParameterNameExtractor.GetFromDisplayName(RingtoetsCommonFormsResources.Structure_StormDuration_DisplayName)),
                 new NumericInputRule(input.DeviationWaveDirection,