Index: Ringtoets/StabilityPointStructures/src/Ringtoets.StabilityPointStructures.Data/GeneralStabilityPointStructuresInput.cs
===================================================================
diff -u -r680d50ac48c78aba5bcdb6cc459343ef6941f7a0 -r4e11185058b30d0fc525382d015112be4a2e84f8
--- Ringtoets/StabilityPointStructures/src/Ringtoets.StabilityPointStructures.Data/GeneralStabilityPointStructuresInput.cs	(.../GeneralStabilityPointStructuresInput.cs)	(revision 680d50ac48c78aba5bcdb6cc459343ef6941f7a0)
+++ Ringtoets/StabilityPointStructures/src/Ringtoets.StabilityPointStructures.Data/GeneralStabilityPointStructuresInput.cs	(.../GeneralStabilityPointStructuresInput.cs)	(revision 4e11185058b30d0fc525382d015112be4a2e84f8)
@@ -31,15 +31,17 @@
     /// </summary>
     public class GeneralStabilityPointStructuresInput
     {
-        private static readonly Range<double> validityRangeN = new Range<double>(1.0, 20.0);
+        private const int numberOfDecimalPlacesN = 2;
+        private static readonly Range<RoundedDouble> validityRangeN = new Range<RoundedDouble>(new RoundedDouble(numberOfDecimalPlacesN, 1),
+                                                                                               new RoundedDouble(numberOfDecimalPlacesN, 20));
         private RoundedDouble n;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="GeneralStabilityPointStructuresInput"/> class.
         /// </summary>
         public GeneralStabilityPointStructuresInput()
         {
-            n = new RoundedDouble(2, 3.0);
+            n = new RoundedDouble(numberOfDecimalPlacesN, 3.0);
 
             GravitationalAcceleration = new RoundedDouble(2, 9.81);
 
@@ -87,7 +89,7 @@
         /// Gets or sets the 'N' parameter used to factor in the 'length effect'.
         /// </summary>
         /// <exception cref="ArgumentOutOfRangeException">Thrown when the <paramref name="value"/> is not in
-        /// the interval [1, 20].</exception>
+        /// the interval [1.0, 20.0].</exception>
         public RoundedDouble N
         {
             get
@@ -96,13 +98,14 @@
             }
             set
             {
-                if (!validityRangeN.InRange(value))
+                RoundedDouble newValue = value.ToPrecision(n.NumberOfDecimalPlaces);
+                if (!validityRangeN.InRange(newValue))
                 {
                     throw new ArgumentOutOfRangeException(nameof(value), string.Format(Resources.N_Value_should_be_in_Range_0_,
                                                                                        validityRangeN));
                 }
 
-                n = value.ToPrecision(n.NumberOfDecimalPlaces);
+                n = newValue;
             }
         }