Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingInputContextProperties.cs
===================================================================
diff -u -rac582bc093c8a275cd9b5dc2148af313b5242062 -r917edb0f289fcc7259995bc8da2678142c16620c
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingInputContextProperties.cs	(.../PipingInputContextProperties.cs)	(revision ac582bc093c8a275cd9b5dc2148af313b5242062)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingInputContextProperties.cs	(.../PipingInputContextProperties.cs)	(revision 917edb0f289fcc7259995bc8da2678142c16620c)
@@ -22,6 +22,7 @@
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Drawing.Design;
+using Core.Common.Base;
 using Core.Common.Base.Data;
 using Core.Common.Base.Geometry;
 using Core.Common.Gui.Attributes;
@@ -32,6 +33,7 @@
 using Ringtoets.Common.Forms.Helpers;
 using Ringtoets.Common.Forms.PresentationObjects;
 using Ringtoets.Common.Forms.UITypeEditors;
+using Ringtoets.Common.Service;
 using Ringtoets.Piping.Data;
 using Ringtoets.Piping.Forms.PresentationObjects;
 using Ringtoets.Piping.Forms.Properties;
@@ -152,7 +154,7 @@
             set
             {
                 data.WrappedData.HydraulicBoundaryLocation = value.HydraulicBoundaryLocation;
-                data.WrappedData.NotifyObservers();
+                NotifyPropertyChanged();
             }
         }
 
@@ -170,7 +172,7 @@
             set
             {
                 data.WrappedData.AssessmentLevel = value;
-                data.WrappedData.NotifyObservers();
+                NotifyPropertyChanged();
             }
         }
 
@@ -187,7 +189,7 @@
             set
             {
                 data.WrappedData.UseAssessmentLevelManualInput = value;
-                data.NotifyObservers();
+                NotifyPropertyChanged();
             }
         }
 
@@ -205,7 +207,7 @@
             set
             {
                 data.WrappedData.DampingFactorExit = value.Distribution;
-                data.WrappedData.NotifyObservers();
+                NotifyPropertyChanged();
             }
         }
 
@@ -223,7 +225,7 @@
             set
             {
                 data.WrappedData.PhreaticLevelExit = value.Distribution;
-                data.WrappedData.NotifyObservers();
+                NotifyPropertyChanged();
             }
         }
 
@@ -260,7 +262,7 @@
                 {
                     data.WrappedData.SurfaceLine = value;
                     PipingInputService.SetMatchingStochasticSoilModel(data.WrappedData, GetAvailableStochasticSoilModels());
-                    data.WrappedData.NotifyObservers();
+                    NotifyPropertyChanged();
                 }
             }
         }
@@ -282,7 +284,7 @@
                 {
                     data.WrappedData.StochasticSoilModel = value;
                     PipingInputService.SyncStochasticSoilProfileWithStochasticSoilModel(data.WrappedData);
-                    data.WrappedData.NotifyObservers();
+                    NotifyPropertyChanged();
                 }
             }
         }
@@ -303,7 +305,7 @@
                 if (!ReferenceEquals(value, data.WrappedData.StochasticSoilProfile))
                 {
                     data.WrappedData.StochasticSoilProfile = value;
-                    data.WrappedData.NotifyObservers();
+                    NotifyPropertyChanged();
                 }
             }
         }
@@ -321,7 +323,7 @@
             set
             {
                 data.WrappedData.EntryPointL = value;
-                data.WrappedData.NotifyObservers();
+                NotifyPropertyChanged();
             }
         }
 
@@ -338,7 +340,7 @@
             set
             {
                 data.WrappedData.ExitPointL = value;
-                data.WrappedData.NotifyObservers();
+                NotifyPropertyChanged();
             }
         }
 
@@ -434,5 +436,15 @@
         }
 
         #endregion
+
+        private void NotifyPropertyChanged()
+        {
+            IEnumerable<IObservable> affectedCalculation = RingtoetsCommonDataSynchronizationService.ClearCalculationOutput(data.PipingCalculation);
+            foreach (var calculation in affectedCalculation)
+            {
+                calculation.NotifyObservers();
+            }
+            data.WrappedData.NotifyObservers();
+        }
     }
 }
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