Index: src/Deltares.DSoilModel.Data/SosSoilProfilesImporter.cs
===================================================================
diff -u -r262 -r283
--- src/Deltares.DSoilModel.Data/SosSoilProfilesImporter.cs	(.../SosSoilProfilesImporter.cs)	(revision 262)
+++ src/Deltares.DSoilModel.Data/SosSoilProfilesImporter.cs	(.../SosSoilProfilesImporter.cs)	(revision 283)
@@ -56,6 +56,13 @@
                                 "remark",
                                 "extra"
                             };
+                            string[] requiredHeaders = new string[] 
+                            {
+                                "soilprofile_id",
+                                "top_level",
+                                "soil_name"
+                            };
+
                             // The definition of the csv contains one extra column (soil_type) which is now optional.
                             // Next to that 5 extra optional columns are added for the SOS-import of which one (named extra) is unused for now
                             // So number of columns may vary from 3 to 9.
@@ -64,6 +71,18 @@
                                 string csvHeaderError = LocalizationManager.GetTranslatedText(this, "csvHeaderError");
                                 throw new CsvImporterSoilProfilesException(String.Format("{0} : {1}", fileName, csvHeaderError));
                             }
+
+                            //Check that all required column names are present
+                            var missingNames = GetMissingSoilProfileHeaders(headers, requiredHeaders);
+                            if (missingNames != "")
+                            {
+                                string csvHeaderError = LocalizationManager.GetTranslatedText(this, "csvHeaderMissingColumns");
+                                string csvNotImported = LocalizationManager.GetTranslatedText(this, "csvNotImported");
+                                LogManager.Messages.Add(new LogMessage(LogMessageType.Error, this, String.Format("{0} : {1} -- {2}", fileName, csvHeaderError, missingNames)));
+                                LogManager.Messages.Add(new LogMessage(LogMessageType.Warning, this, String.Format("{0} : {1}", fileName, csvNotImported)));
+                                return;
+                            }
+ 
                             //Check that all column names are known
                             var invalidNames = GetInvalidSoilProfileHeaders(headers, validHeaders);
                             if (invalidNames != "")
@@ -302,5 +321,34 @@
             }
             return invalidHeaders;
         }
+
+        private string GetMissingSoilProfileHeaders(string[] headers, string[] requiredHeaders)
+        {
+            string missingHeaders = "";
+            foreach (var name in requiredHeaders)
+            {
+                bool found = false;
+                foreach (var header in headers)
+                {
+                    if (name.Equals(header))
+                    {
+                        found = true;
+                        break;
+                    }
+                }
+                if (!found)
+                {
+                    if (missingHeaders == "")
+                    {
+                        missingHeaders = name;
+                    }
+                    else
+                    {
+                        missingHeaders = missingHeaders + ", " + name;
+                    }
+                }
+            }
+            return missingHeaders;
+        }
     }
 }
\ No newline at end of file
Index: src/Deltares.DSoilModel.Tests/TestFiles/DSoilModelsoilprofilesWithInvalidHeaders.csv
===================================================================
diff -u -r262 -r283
--- src/Deltares.DSoilModel.Tests/TestFiles/DSoilModelsoilprofilesWithInvalidHeaders.csv	(.../DSoilModelsoilprofilesWithInvalidHeaders.csv)	(revision 262)
+++ src/Deltares.DSoilModel.Tests/TestFiles/DSoilModelsoilprofilesWithInvalidHeaders.csv	(.../DSoilModelsoilprofilesWithInvalidHeaders.csv)	(revision 283)
@@ -1,4 +1,4 @@
-soilprofile_id;top_level;Soil_name;soiltype
+soilprofile_id;top_level;soil_name;soiltype
 10Z_286_STBI;33;ZAND;zand
 10Z_286_STBI;-11.5;ZAND;Zand
 10Z_311_STBI;60;VEEN;Veen
Index: src/Deltares.DSoilModel.Tests/TestFiles/DSoilModelsoilprofilesWithMissingHeaders.csv
===================================================================
diff -u
--- src/Deltares.DSoilModel.Tests/TestFiles/DSoilModelsoilprofilesWithMissingHeaders.csv	(revision 0)
+++ src/Deltares.DSoilModel.Tests/TestFiles/DSoilModelsoilprofilesWithMissingHeaders.csv	(revision 283)
@@ -0,0 +1,8 @@
+soilprofile_id;extra;soil_name;soil_type
+10Z_286_STBI;33;ZAND;zand
+10Z_286_STBI;-11.5;ZAND;Zand
+10Z_311_STBI;60;VEEN;Veen
+10Z_311_STBI;-3.2;VEEN;Zand
+10Z_327_STBI;60;kLEI (0);Veen
+10Z_400_STBI;60;WL_zanD;Veen
+10Z_400_STBI;-0.9;wl_zand;Veen
Index: src/Deltares.DSoilModel.Tests/Deltares.DSoilModel.Tests.csproj
===================================================================
diff -u -r263 -r283
--- src/Deltares.DSoilModel.Tests/Deltares.DSoilModel.Tests.csproj	(.../Deltares.DSoilModel.Tests.csproj)	(revision 263)
+++ src/Deltares.DSoilModel.Tests/Deltares.DSoilModel.Tests.csproj	(.../Deltares.DSoilModel.Tests.csproj)	(revision 283)
@@ -127,6 +127,9 @@
     <None Include="TestFiles\DSoilModelsoilprofilesWithInvalidHeaders.csv">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <None Include="TestFiles\DSoilModelsoilprofilesWithMissingHeaders.csv">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
     <None Include="TestFiles\DSoilModelsoilprofilesWithSoilTypes.csv">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
Index: src/Deltares.DSoilModel.Data/Translations.xml
===================================================================
diff -u -r262 -r283
--- src/Deltares.DSoilModel.Data/Translations.xml	(.../Translations.xml)	(revision 262)
+++ src/Deltares.DSoilModel.Data/Translations.xml	(.../Translations.xml)	(revision 283)
@@ -25,7 +25,9 @@
   <Translation ID="SosLayerDataError" en-US="The values of max-d, top_level and min-d must be descending in that order." nl-NL="De waarden van max-d, top_level en min-d moeten aflopend zijn in deze volgorde." />
   <Translation ID="CsvSoilProfileRefused" en-US="The profile is not added to the data!" nl-NL="Het profiel is niet toegevoegd aan de data." />
   <Translation ID="csvHeaderError" en-US="Number of columns in the CSV file must be between 3 and 9." nl-NL="Het aantal kolommen in de CSV file moet tussen 3 en 9 zijn." />
-  <Translation ID="csvHeaderInvalidColumns" en-US="{0}: One or more columns names unknown" nl-NL="Een of meer kolomnamen onbekend" />
+  <Translation ID="csvHeaderInvalidColumns" en-US="One or more column names unknown" nl-NL="Een of meer kolomnamen onbekend" />
+  <Translation ID="csvHeaderMissingColumns" en-US="One or more required column names missing" nl-NL="Een of meer verplichte kolomnamen ontbreken" />
+  <Translation ID="csvNotImported" en-US="The CSV file could not be imported" nl-NL="De CSV-file niet worden geimporteerd" />
   <Translation ID="SoilSegmentRefused" en-US="Segment {0} is refused as one or more profiles are missing." nl-NL="Segment {0} is geweigerd omdat deze een of meer profielen mist." />
   <Translation ID="MaximumTopLevel" en-US="Maximum value toplevel" nl-NL="Maximale waarde bovenkant" />
   <Translation ID="MinimumTopLevel" en-US="Minimum value toplevel" nl-NL="Minimale waarde bovenkant" />
Index: src/Deltares.DSoilModel.Tests/SosSoilProfilesImporterTests.cs
===================================================================
diff -u -r262 -r283
--- src/Deltares.DSoilModel.Tests/SosSoilProfilesImporterTests.cs	(.../SosSoilProfilesImporterTests.cs)	(revision 262)
+++ src/Deltares.DSoilModel.Tests/SosSoilProfilesImporterTests.cs	(.../SosSoilProfilesImporterTests.cs)	(revision 283)
@@ -244,5 +244,22 @@
                 Assert.AreNotEqual(0,project.SoilProfiles1D.Count, "Expected the profiles were read anyway");
             }
         }
+
+        [Test]
+        public void DSoilModelIO_ImportFromCsvFileWithMissingHeaders()
+        {
+            const string csvFileNameAndRelativePath = @"TestFiles\DSoilModelsoilprofilesWithMissingHeaders.csv";
+
+            // Locate the test files.
+            var currentDirectory = Directory.GetCurrentDirectory();
+            var csvFullFileName = Path.Combine(currentDirectory, csvFileNameAndRelativePath);
+            LogManager.Messages.Clear();
+            using (var project = new DSoilModelProject())
+            {
+                project.ReadSoilProfiles1DFromFile(csvFullFileName);
+                Assert.AreEqual(2, LogManager.Messages.Count, "Expected two messages");
+                Assert.AreEqual(0, project.SoilProfiles1D.Count, "Expected the profiles were not read");
+            }
+        }
     }
 }
\ No newline at end of file