Index: Ringtoets/Common/src/Ringtoets.Common.Service/ValidationRules/UseBreakWaterRule.cs
===================================================================
diff -u -rdc80ceebd52da19d841b46b5300695fd5c83e4a6 -r80f5ef4a85ccbdea70d69e6fbbbe71bc74992db0
--- Ringtoets/Common/src/Ringtoets.Common.Service/ValidationRules/UseBreakWaterRule.cs	(.../UseBreakWaterRule.cs)	(revision dc80ceebd52da19d841b46b5300695fd5c83e4a6)
+++ Ringtoets/Common/src/Ringtoets.Common.Service/ValidationRules/UseBreakWaterRule.cs	(.../UseBreakWaterRule.cs)	(revision 80f5ef4a85ccbdea70d69e6fbbbe71bc74992db0)
@@ -46,7 +46,7 @@
         {
             var messages = new List<string>();
 
-            if (breakWater.UseBreakWater && IsInValidNumber(breakWater.BreakWater.Height))
+            if (breakWater.UseBreakWater && IsInvalidNumber(breakWater.BreakWater.Height))
             {
                 messages.Add(RingtoetsCommonServiceResources.Validation_Invalid_BreakWaterHeight_value);
             }