Index: Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Service/ClosingStructuresCalculationService.cs
===================================================================
diff -u -r602d5e06d2d39e5f5133842526246edb8bb97a16 -rdc80ceebd52da19d841b46b5300695fd5c83e4a6
--- Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Service/ClosingStructuresCalculationService.cs	(.../ClosingStructuresCalculationService.cs)	(revision 602d5e06d2d39e5f5133842526246edb8bb97a16)
+++ Ringtoets/ClosingStructures/src/Ringtoets.ClosingStructures.Service/ClosingStructuresCalculationService.cs	(.../ClosingStructuresCalculationService.cs)	(revision dc80ceebd52da19d841b46b5300695fd5c83e4a6)
@@ -308,6 +308,7 @@
         {
             var validationRules = new List<ValidationRule>
             {
+                new UseBreakWaterRule(input),
                 new VariationCoefficientLogNormalDistributionRule(input.StormDuration,
                                                                   ParameterNameExtractor.GetFromDisplayName(RingtoetsCommonFormsResources.Structure_StormDuration_DisplayName)),
                 new NumericInputRule(input.DeviationWaveDirection,
@@ -339,6 +340,7 @@
         {
             var validationRules = new List<ValidationRule>
             {
+                new UseBreakWaterRule(input),
                 new VariationCoefficientLogNormalDistributionRule(input.StormDuration,
                                                                   ParameterNameExtractor.GetFromDisplayName(RingtoetsCommonFormsResources.Structure_StormDuration_DisplayName)),
                 new NormalDistributionRule(input.InsideWaterLevel,
@@ -368,6 +370,7 @@
         {
             var validationRules = new List<ValidationRule>
             {
+                new UseBreakWaterRule(input),
                 new VariationCoefficientLogNormalDistributionRule(input.StormDuration,
                                                                   ParameterNameExtractor.GetFromDisplayName(RingtoetsCommonFormsResources.Structure_StormDuration_DisplayName)),
                 new NormalDistributionRule(input.InsideWaterLevel,