Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/Commands/AssessmentSectionFromFileCommandHandler.cs
===================================================================
diff -u -rdcc94dbcc481ef9f6f83308b82096f85f9cb6f01 -rd0a9ae3680252d6a0fd203f4c6b1c3d42cd3873b
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/Commands/AssessmentSectionFromFileCommandHandler.cs	(.../AssessmentSectionFromFileCommandHandler.cs)	(revision dcc94dbcc481ef9f6f83308b82096f85f9cb6f01)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/Commands/AssessmentSectionFromFileCommandHandler.cs	(.../AssessmentSectionFromFileCommandHandler.cs)	(revision d0a9ae3680252d6a0fd203f4c6b1c3d42cd3873b)
@@ -21,8 +21,11 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Windows.Forms;
+using Core.Common.Base;
+using Core.Common.Base.Data;
 using Core.Common.Base.IO;
 using Core.Common.Gui;
 using Core.Common.Gui.Forms.ViewHost;
@@ -287,8 +290,13 @@
             }
             catch (ArgumentOutOfRangeException exception)
             {
-                log.Error(string.Format(Resources.AssessmentSectionFromFileCommandHandler_CreateAssessmentSection_Unable_to_create_assessmentSection_with_Norm_0, exception.ActualValue),
-                          exception);
+                var normValidityRange = new Range<double>(1.0 / 1000000, 1.0 / 10);
+                string message = string.Format(Resources.AssessmentSectionFromFileCommandHandler_Unable_to_create_assessmentSection_with_LowerLimitNorm_0_and_SignalingNorm_1_Norms_should_be_in_Range_2_,
+                                               ProbabilityFormattingHelper.Format(lowerLimitNorm),
+                                               ProbabilityFormattingHelper.Format(signalingNorm),
+                                               normValidityRange.ToString(FormattableConstants.ShowAtLeastOneDecimal, CultureInfo.CurrentCulture));
+
+                log.Error(message, exception);
             }
             return null;
         }
Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/Properties/Resources.Designer.cs
===================================================================
diff -u -rdcc94dbcc481ef9f6f83308b82096f85f9cb6f01 -rd0a9ae3680252d6a0fd203f4c6b1c3d42cd3873b
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision dcc94dbcc481ef9f6f83308b82096f85f9cb6f01)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision d0a9ae3680252d6a0fd203f4c6b1c3d42cd3873b)
@@ -186,12 +186,12 @@
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Het traject kan niet aangemaakt worden met normwaarde {0}..
+        ///   Looks up a localized string similar to Het traject kan niet aangemaakt worden met een ondergrens van {0} en een signaleringswaarde van {1}. De waarde van de ondergrens en signaleringswaarde moet in het bereik {2} liggen en de ondergrens moet gelijk zijn aan of groter zijn dan de signaleringswaarde..
         /// </summary>
-        public static string AssessmentSectionFromFileCommandHandler_CreateAssessmentSection_Unable_to_create_assessmentSection_with_Norm_0 {
+        public static string AssessmentSectionFromFileCommandHandler_Unable_to_create_assessmentSection_with_LowerLimitNorm_0_and_SignalingNorm_1_Norms_should_be_in_Range_2_ {
             get {
-                return ResourceManager.GetString("AssessmentSectionFromFileCommandHandler_CreateAssessmentSection_Unable_to_create_" +
-                        "assessmentSection_with_Norm_0", resourceCulture);
+                return ResourceManager.GetString("AssessmentSectionFromFileCommandHandler_Unable_to_create_assessmentSection_with_L" +
+                        "owerLimitNorm_0_and_SignalingNorm_1_Norms_should_be_in_Range_2_", resourceCulture);
             }
         }
         
Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/Properties/Resources.resx
===================================================================
diff -u -rdcc94dbcc481ef9f6f83308b82096f85f9cb6f01 -rd0a9ae3680252d6a0fd203f4c6b1c3d42cd3873b
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/Properties/Resources.resx	(.../Resources.resx)	(revision dcc94dbcc481ef9f6f83308b82096f85f9cb6f01)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/Properties/Resources.resx	(.../Resources.resx)	(revision d0a9ae3680252d6a0fd203f4c6b1c3d42cd3873b)
@@ -213,8 +213,8 @@
   <data name="AssessmentSectionFromFileCommandHandler_CreateAssessmentSection_Importing_ReferenceLineFailed" xml:space="preserve">
     <value>Het importeren van de referentielijn is mislukt.</value>
   </data>
-  <data name="AssessmentSectionFromFileCommandHandler_CreateAssessmentSection_Unable_to_create_assessmentSection_with_Norm_0" xml:space="preserve">
-    <value>Het traject kan niet aangemaakt worden met normwaarde {0}.</value>
+  <data name="AssessmentSectionFromFileCommandHandler_Unable_to_create_assessmentSection_with_LowerLimitNorm_0_and_SignalingNorm_1_Norms_should_be_in_Range_2_" xml:space="preserve">
+    <value>Het traject kan niet aangemaakt worden met een ondergrens van {0} en een signaleringswaarde van {1}. De waarde van de ondergrens en signaleringswaarde moet in het bereik {2} liggen en de ondergrens moet gelijk zijn aan of groter zijn dan de signaleringswaarde.</value>
   </data>
   <data name="AssessmentSectionFolder" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\Resources\folder-stand32.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
Index: Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Commands/AssessmentSectionFromFileCommandHandlerTest.cs
===================================================================
diff -u -rcfcd37dd331fbac6f87dde2a1eb2e20d0d0c2726 -rd0a9ae3680252d6a0fd203f4c6b1c3d42cd3873b
--- Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Commands/AssessmentSectionFromFileCommandHandlerTest.cs	(.../AssessmentSectionFromFileCommandHandlerTest.cs)	(revision cfcd37dd331fbac6f87dde2a1eb2e20d0d0c2726)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Commands/AssessmentSectionFromFileCommandHandlerTest.cs	(.../AssessmentSectionFromFileCommandHandlerTest.cs)	(revision d0a9ae3680252d6a0fd203f4c6b1c3d42cd3873b)
@@ -484,7 +484,9 @@
             Action call = () => assessmentSectionFromFileCommandHandler.AddAssessmentSectionFromFile();
 
             // Assert
-            const string expectedMessage = "Het traject kan niet aangemaakt worden met normwaarde 1,12500011250001E-07.";
+            const string expectedMessage = "Het traject kan niet aangemaakt worden met een ondergrens van 1/9.999.999 en een signaleringswaarde van 1/8.888.888. " +
+                                           "De waarde van de ondergrens en signaleringswaarde moet in het bereik [0,000001, 0,1] liggen en " +
+                                           "de ondergrens moet gelijk zijn aan of groter zijn dan de signaleringswaarde.";
             TestHelper.AssertLogMessagesWithLevelAndLoggedExceptions(call, tuples =>
             {
                 Tuple<string, Level, Exception> tuple = tuples.Single();