Index: Riskeer/Common/src/Riskeer.Common.IO/Configurations/Import/CalculationConfigurationSchemaDefinition.cs
===================================================================
diff -u -rbd73199a78ff34583e1ec88e34a66ecbc1774e74 -r40064b948b1fa5e1e351057a6d4557cd2810733c
--- Riskeer/Common/src/Riskeer.Common.IO/Configurations/Import/CalculationConfigurationSchemaDefinition.cs	(.../CalculationConfigurationSchemaDefinition.cs)	(revision bd73199a78ff34583e1ec88e34a66ecbc1774e74)
+++ Riskeer/Common/src/Riskeer.Common.IO/Configurations/Import/CalculationConfigurationSchemaDefinition.cs	(.../CalculationConfigurationSchemaDefinition.cs)	(revision 40064b948b1fa5e1e351057a6d4557cd2810733c)
@@ -41,19 +41,14 @@
                                                         IDictionary<string, string> nestedSchemaDefinitions,
                                                         string migrationScript)
         {
-            if (NestedSchemaDefinitions == null)
-            {
-                throw new ArgumentNullException(nameof(nestedSchemaDefinitions));
-            }
-
             VersionNumber = versionNumber;
             MainSchemaDefinition = mainSchemaDefinition;
             NestedSchemaDefinitions = nestedSchemaDefinitions;
             MigrationScript = migrationScript;
         }
 
         /// <summary>
-        /// Gets the version schema definition.
+        /// Gets the version number of the xml that applies to this definition.
         /// </summary>
         public int VersionNumber { get; }
 
Index: Riskeer/Common/src/Riskeer.Common.IO/Properties/Resources.Designer.cs
===================================================================
diff -u -rff9988223e8a06d0f7a5016d3e53079ecb8233cf -r40064b948b1fa5e1e351057a6d4557cd2810733c
--- Riskeer/Common/src/Riskeer.Common.IO/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision ff9988223e8a06d0f7a5016d3e53079ecb8233cf)
+++ Riskeer/Common/src/Riskeer.Common.IO/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision 40064b948b1fa5e1e351057a6d4557cd2810733c)
@@ -293,7 +293,7 @@
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Het versienummer van het bestand wordt niet ondersteund..
+        ///   Looks up a localized string similar to het versienummer van het bestand wordt niet ondersteund..
         /// </summary>
         public static string CalculationConfigurationReader_GetSchemaDefinition_Not_supported_version {
             get {
Index: Riskeer/Common/src/Riskeer.Common.IO/Properties/Resources.resx
===================================================================
diff -u -rff9988223e8a06d0f7a5016d3e53079ecb8233cf -r40064b948b1fa5e1e351057a6d4557cd2810733c
--- Riskeer/Common/src/Riskeer.Common.IO/Properties/Resources.resx	(.../Resources.resx)	(revision ff9988223e8a06d0f7a5016d3e53079ecb8233cf)
+++ Riskeer/Common/src/Riskeer.Common.IO/Properties/Resources.resx	(.../Resources.resx)	(revision 40064b948b1fa5e1e351057a6d4557cd2810733c)
@@ -880,7 +880,7 @@
     <value>..\Resources\VersieSchema.xsd;System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089;utf-8</value>
   </data>
   <data name="CalculationConfigurationReader_GetSchemaDefinition_Not_supported_version" xml:space="preserve">
-    <value>Het versienummer van het bestand wordt niet ondersteund.</value>
+    <value>het versienummer van het bestand wordt niet ondersteund.</value>
   </data>
   <data name="CalculationConfigurationReader_MigrateToNewSchema_An_unexpected_error_occurred" xml:space="preserve">
     <value>er is een onverwachte fout opgetreden.</value>