Index: DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/TestData/CSVData/Full1DProject/ImportMSoilBase.defx
===================================================================
diff -u
--- DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/TestData/CSVData/Full1DProject/ImportMSoilBase.defx	(revision 0)
+++ DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/TestData/CSVData/Full1DProject/ImportMSoilBase.defx	(revision 4217)
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<DatasourceContainer Key="1" SoilProfileCharacteristicPointReference="DikeToeAtPolder" IsImportAsRelativeProfiles="True">
+  <DataSourceList>
+    <DataSource Key="2" DataSourceType="CsvFiles" DataLocation="csvfiles\" />
+	<DataSource Key="3" DataSourceType="MSoilBase" DataLocation="csvfiles\soilmaterials.mdb" />");	
+  </DataSourceList>
+  <DataAttributes>
+  </DataAttributes>
+</DatasourceContainer>
\ No newline at end of file
Index: DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/WaterBoardImporterTests.cs
===================================================================
diff -u -r4178 -r4217
--- DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/WaterBoardImporterTests.cs	(.../WaterBoardImporterTests.cs)	(revision 4178)
+++ DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/WaterBoardImporterTests.cs	(.../WaterBoardImporterTests.cs)	(revision 4217)
@@ -124,11 +124,11 @@
 
         dataSourceContainer = DataSourceContainer.Deserialize(definitionFilename);
         string damImportFolder = Path.GetDirectoryName(definitionFilename);
-        IList<string> dikeList = WaterBoardImporter.ImportDikeRingIds(damImportFolder, dataSourceContainer, 
+        IList<string> dikeList = WaterBoardImporter.ImportDikeRingIds(damImportFolder, dataSourceContainer,
                                                                       DamProjectType.Calamity, out _).ToList();
-        using WaterBoard waterBoard = WaterBoardImporter.ImportDataForDikeRings("", damImportFolder, 
-                                                                                dataSourceContainer, dikeList, 
-                                                                                DamProjectType.Calamity, null, 
+        using WaterBoard waterBoard = WaterBoardImporter.ImportDataForDikeRings("", damImportFolder,
+                                                                                dataSourceContainer, dikeList,
+                                                                                DamProjectType.Calamity, null,
                                                                                 out List<LogMessage> _);
 
         // Check Dike
@@ -194,10 +194,10 @@
 
         dataSourceContainer = DataSourceContainer.Deserialize(definitionFilename);
         string damImportFolder = Path.GetDirectoryName(definitionFilename);
-        IList<string> dikeList = WaterBoardImporter.ImportDikeRingIds(damImportFolder, dataSourceContainer, 
+        IList<string> dikeList = WaterBoardImporter.ImportDikeRingIds(damImportFolder, dataSourceContainer,
                                                                       DamProjectType.Calamity, out _).ToList();
-        using WaterBoard waterBoard = WaterBoardImporter.ImportDataForDikeRings("", damImportFolder, 
-                                                                                dataSourceContainer, dikeList, 
+        using WaterBoard waterBoard = WaterBoardImporter.ImportDataForDikeRings("", damImportFolder,
+                                                                                dataSourceContainer, dikeList,
                                                                                 DamProjectType.Calamity, null, out List<LogMessage> _);
 
         // Check Dike
@@ -293,6 +293,17 @@
     }
 
     [Test]
+    public void ThrowsExceptionWhenOpeningDatasourceFileWithSoilBaseDefinition()
+    {
+        const string definitionFilename = @".\TestData\CSVData\Full1DProject\ImportMSoilBase.defx";
+        dataSourceContainer = DataSourceContainer.Deserialize(definitionFilename);
+        string damImportFolder = Path.GetDirectoryName(definitionFilename);
+        Assert.That(() => WaterBoardImporter.ImportDikeRingIds(damImportFolder, dataSourceContainer, DamProjectType.Calamity,
+                                                               out _),
+                    Throws.InstanceOf<DataPluginImporterException>().With.Message.EqualTo("DataLocation is empty. Perhaps the DataSourceType is not supported."));
+    }
+
+    [Test]
     [Category("Slow")]
     public void IsZoneDataReadCorrectlyFromCsvFiles()
     {
@@ -321,7 +332,7 @@
     }
 
     private void SetupForCsvFilesImport()
-    { 
+    {
         var srcDataSources = new List<DataSource>
         {
             new()
Index: DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/Deltares.Dam.Tests.csproj
===================================================================
diff -u -r4216 -r4217
--- DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/Deltares.Dam.Tests.csproj	(.../Deltares.Dam.Tests.csproj)	(revision 4216)
+++ DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/Deltares.Dam.Tests.csproj	(.../Deltares.Dam.Tests.csproj)	(revision 4217)
@@ -273,6 +273,9 @@
         <None Update="TestData\CSVData\Full1DProject\Import relative soilprofiles.defx">
             <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
         </None>
+        <None Update="TestData\CSVData\Full1DProject\ImportMSoilBase.defx">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </None>
         <None Update="TestData\CSVData\Full2DProject\csvfiles\Geometries\10Y_005_STBI.sti">
             <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
         </None>
Index: DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/DataPluginImporterTests.cs
===================================================================
diff -u -r4214 -r4217
--- DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/DataPluginImporterTests.cs	(.../DataPluginImporterTests.cs)	(revision 4214)
+++ DamClients/DamUI/trunk/src/Dam/Deltares.Dam.Tests/DataPluginImporterTests.cs	(.../DataPluginImporterTests.cs)	(revision 4217)
@@ -1118,5 +1118,18 @@
                 writer.WriteLine("RK210-570;1;3.14");
             }
         }
+        
+        private static void CreateDatasourceFile(string filePath)
+        {
+            using StreamWriter writer = File.CreateText(filePath);
+            
+            writer.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
+            writer.WriteLine("<DatasourceContainer Key=\"1\">");
+            writer.WriteLine("  <DataSourceList>");
+            writer.WriteLine("    <DataSource Key=\"2\" DataSourceType=\"CsvFiles\" DataLocation=\"DAM invoerfiles\\\" />");
+            writer.WriteLine("    <DataSource Key=\"3\" DataSourceType=\"MSoilBase\" DataLocation=\"DAM invoerfiles\\soilmaterials.mdb\" />");
+            writer.WriteLine("  </DataSourceList>");
+            writer.WriteLine("</DatasourceContainer>");
+        }
     }
 }
\ No newline at end of file