Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculatorSingle.cs
===================================================================
diff -u -r6404 -r7002
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculatorSingle.cs	(.../DesignCalculatorSingle.cs)	(revision 6404)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/DikesDesign/DesignCalculatorSingle.cs	(.../DesignCalculatorSingle.cs)	(revision 7002)
@@ -63,12 +63,19 @@
             int errorCount = kernelWrapper.Validate(kernelDataInput, kernelDataOutput, out validationMessages);
             if (errorCount > 0)
             {
-                locationCalculationMessages.Add(new LogMessage(LogMessageType.Error, null,
-                                                               string.Format(Resources.DesignCalculatorValidationFailed,
-                                                                             damKernelInput.Location.Name,
-                                                                             damKernelInput.SubSoilScenario,
-                                                                             designScenario.LocationScenarioID)));
-                locationCalculationMessages.AddRange(validationMessages);
+                var validationStringBuilder = new StringBuilder();
+                if (validationMessages != null && validationMessages.Count > 0)
+                {
+                    foreach (var validationMessage in validationMessages)
+                    {
+                        validationStringBuilder.AppendLine(validationMessage.Message);
+                    }
+                }
+                string message = string.Format(Resources.DesignCalculatorValidationFailed,
+                                               damKernelInput.Location.Name,
+                                               damKernelInput.SubSoilScenario,
+                                               designScenario.LocationScenarioID) + validationStringBuilder.ToString();
+                locationCalculationMessages.Add(new LogMessage(LogMessageType.Error, null, message));
             }
             else
             {