Index: Ringtoets/Common/src/Ringtoets.Common.Service/RingtoetsCommonDataCalculationService.cs
===================================================================
diff -u -r9798fd949a2e90dfe1750377f9757fc456571ed1 -rdd5aa48365b805d37f8ecce133832e5b920f5064
--- Ringtoets/Common/src/Ringtoets.Common.Service/RingtoetsCommonDataCalculationService.cs	(.../RingtoetsCommonDataCalculationService.cs)	(revision 9798fd949a2e90dfe1750377f9757fc456571ed1)
+++ Ringtoets/Common/src/Ringtoets.Common.Service/RingtoetsCommonDataCalculationService.cs	(.../RingtoetsCommonDataCalculationService.cs)	(revision dd5aa48365b805d37f8ecce133832e5b920f5064)
@@ -52,19 +52,18 @@
         /// <param name="failureMechanismContribution">The failure mechanism contribution.</param>
         /// <param name="n">The 'N' parameter used to factor in the 'length effect'.</param>
         /// <returns>The profile specific required probability.</returns>
-        /// <exception cref="ArgumentOutOfRangeException">Thrown when <paramref name="failureMechanismContribution"/> 
-        /// or <paramref name="n"/> is not greater than 0.</exception>
+        /// <exception cref="ArgumentOutOfRangeException">Thrown when <paramref name="failureMechanismContribution"/> is not greater than 0 
+        /// or when <paramref name="n"/> is 0.</exception>
         public static double ProfileSpecificRequiredProbability(double norm, double failureMechanismContribution, int n)
         {
             if (!(failureMechanismContribution > 0))
             {
                 throw new ArgumentOutOfRangeException("failureMechanismContribution", failureMechanismContribution,
-                                                      Resources.RingtoetsCommonDataCalculationService_ProfileSpecificRequiredProbability_Contribution_is_zero);
+                                                      Resources.RingtoetsCommonDataCalculationService_ProfileSpecificRequiredProbability_Contribution_is_zero_or_negative);
             }
-            if (!(n > 0))
+            if (n == 0)
             {
-                throw new ArgumentOutOfRangeException("n", n,
-                                                      Resources.RingtoetsCommonDataCalculationService_ProfileSpecificRequiredProbability_N_is_zero);
+                throw new ArgumentOutOfRangeException("n", n, Resources.RingtoetsCommonDataCalculationService_ProfileSpecificRequiredProbability_N_is_zero);
             }
 
             return norm*(failureMechanismContribution/100)/n;