Index: src/Deltares.DSoilModel.Data/DSoilModelProject.cs
===================================================================
diff -u -r483 -r499
--- src/Deltares.DSoilModel.Data/DSoilModelProject.cs	(.../DSoilModelProject.cs)	(revision 483)
+++ src/Deltares.DSoilModel.Data/DSoilModelProject.cs	(.../DSoilModelProject.cs)	(revision 499)
@@ -11,6 +11,7 @@
 using Deltares.Geotechnics.IO;
 using Deltares.Geotechnics.IO.Importers;
 using Deltares.Geotechnics.Mechanisms;
+using Deltares.Geotechnics.Xsd;
 using Deltares.MStab.IO.Classic;
 using Deltares.Probabilistic;
 using Deltares.Soilbase;
@@ -506,6 +507,12 @@
             }
             if (conePenetrationTestData != null)
             {
+                if (conePenetrationTestData.LevelType != CPTLevelType.NAP || conePenetrationTestData.XYCoordinateSystem != CPTXYCoordinateSystem.RD)
+                {
+                    var msg = String.Format(LocalizationManager.GetTranslatedText(this, "gefCoordinateSystemError"), fileName);
+                    LogManager.Add(new LogMessage(LogMessageType.Error, null, msg));
+                    return false;
+                }
                 UniqueNameProvider.ProvideUniqueName(cpts, conePenetrationTestData);
                 cpts.Add(conePenetrationTestData);
                 return true;
@@ -529,6 +536,13 @@
             }
             if (boring != null)
             {
+                if (boring.ZcoordinateSystem != "NAP" || boring.XyCoordinateSystem != "RD")
+                {
+                    var msg = String.Format(LocalizationManager.GetTranslatedText(this, "gefCoordinateSystemError"), fileName);
+                    LogManager.Add(new LogMessage(LogMessageType.Error, null, msg));
+                    return false;
+                }
+
                 // Ensure unique name
                 UniqueNameProvider.ProvideUniqueName(borings, boring);
                 borings.Add(boring);