Index: DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/PlLinesHelper.cs
===================================================================
diff -u -r6404 -r6851
--- DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/PlLinesHelper.cs	(.../PlLinesHelper.cs)	(revision 6404)
+++ DamEngine/trunk/src/Deltares.DamEngine.Calculators/KernelWrappers/Common/PlLinesHelper.cs	(.../PlLinesHelper.cs)	(revision 6851)
@@ -44,10 +44,11 @@
     /// <param name="waterLevelRiverLow">The water level river low.</param>
     /// <param name="sensorPlLineCreatorSettings">The sensor pl line creator settings.</param>
     /// <param name="upliftSituation">The uplift situation.</param>
+    /// <param name="warningMessage">The warning message.</param>
     /// <returns>The created Pl-lines</returns>
     public static PlLines CreatePlLinesForStability(Location location, SoilGeometryProbability subSoilScenario,
                                                     double waterLevel, double? waterLevelRiverLow, SensorPlLineCreatorSettings sensorPlLineCreatorSettings,
-                                                    out UpliftSituation upliftSituation)
+                                                    out UpliftSituation upliftSituation, out string warningMessage)
     {
         PlLines plLines = null;
         upliftSituation = new UpliftSituation();
@@ -56,7 +57,7 @@
             case PlLineCreationMethod.ExpertKnowledgeLinearInDike:
             case PlLineCreationMethod.ExpertKnowledgeRRD:
                 plLines = CreatePlLinesForStabilityExpertKnowledge(location, subSoilScenario,
-                                                                   waterLevel, waterLevelRiverLow, out upliftSituation);
+                                                                   waterLevel, waterLevelRiverLow, out upliftSituation, out warningMessage);
                 break;
             case PlLineCreationMethod.Sensors:
                 plLines = CreatePlLinesForStabilitySensors(location, sensorPlLineCreatorSettings);
@@ -65,6 +66,7 @@
                 throw new NotImplementedException($@"Pl-line creation method '{location.ModelParametersForPlLines.PlLineCreationMethod}' is not implemented");
         }
 
+        warningMessage = null;
         return plLines;
     }
 
@@ -101,9 +103,11 @@
     /// <param name="location">The location.</param>
     /// <param name="soilProfile">The soil profile.</param>
     /// <param name="waterLevel">The water level.</param>
+    /// <param name="warningMessage">The warning message.</param>
     /// <returns></returns>
-    public static PlLines CreatePlLinesForPiping(DateTime timeStepDateTime, Location location, SoilProfile1D soilProfile, double waterLevel)
+    public static PlLines CreatePlLinesForPiping(DateTime timeStepDateTime, Location location, SoilProfile1D soilProfile, double waterLevel, out string warningMessage)
     {
+        warningMessage = null;
         var plLinesCreator = new PlLinesCreator.PlLinesCreator
         {
             WaterLevelRiverHigh = waterLevel,
@@ -131,7 +135,7 @@
         }
         else
         {
-            plLines = plLinesCreator.CreateAllPlLines(location);
+            plLines = plLinesCreator.CreateAllPlLines(location, out warningMessage);
         }
 
         return plLines;
@@ -145,10 +149,13 @@
     /// <param name="waterLevel">The water level.</param>
     /// <param name="waterLevelRiverLow">The water level river low.</param>
     /// <param name="upliftSituation">The uplift situation.</param>
+    /// <param name="warningMessage">The warning message.</param>
     /// <returns>The created Pl-lines</returns>
     private static PlLines CreatePlLinesForStabilityExpertKnowledge(Location location, SoilGeometryProbability subSoilScenario,
-                                                                    double waterLevel, double? waterLevelRiverLow, out UpliftSituation upliftSituation)
+                                                                    double waterLevel, double? waterLevelRiverLow, out UpliftSituation upliftSituation,
+                                                                    out string warningMessage)
     {
+        warningMessage = null;
         var plLinesCreator = new PlLinesCreator.PlLinesCreator
         {
             WaterLevelRiverLow = waterLevelRiverLow,
@@ -176,7 +183,7 @@
             SoilList = location.SoilList
         };
 
-        PlLines plLines = plLinesCreator.CreateAllPlLines(location);
+        PlLines plLines = plLinesCreator.CreateAllPlLines(location, out warningMessage);
         upliftSituation = new UpliftSituation
         {
             Pl3HeadAdjusted = plLinesCreator.Pl3HeadAdjusted,
@@ -187,6 +194,7 @@
             Pl4MinUplift = plLinesCreator.Pl4MinUplift,
             IsUplift = false // must be determined later on; just to avoid compiler error
         };
+
         return plLines;
     }
 }
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