Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingInput.cs
===================================================================
diff -u -r8142644ec1337be8032e9214b1f103c85d9037f7 -r4c1b7cae9e302e07399e1045dac0fe81f1dbe3b5
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingInput.cs	(.../PipingInput.cs)	(revision 8142644ec1337be8032e9214b1f103c85d9037f7)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingInput.cs	(.../PipingInput.cs)	(revision 4c1b7cae9e302e07399e1045dac0fe81f1dbe3b5)
@@ -256,6 +256,11 @@
                                   : new RoundedDouble(2, double.NaN);
         }
 
+        private void UpdateHydraulicBoundaryLocation()
+        {
+            hydraulicBoundaryLocation = null;
+        }
+
         #region Derived input
 
         /// <summary>
@@ -271,6 +276,7 @@
             set
             {
                 assessmentLevel = value.ToPrecision(assessmentLevel.NumberOfDecimalPlaces);
+                UpdateHydraulicBoundaryLocation();
             }
         }