diff --git a/src/main/scala/za/co/absa/standardization/validation/field/FieldValidator.scala b/src/main/scala/za/co/absa/standardization/validation/field/FieldValidator.scala
index 67a3c46..142fd19 100644
--- a/src/main/scala/za/co/absa/standardization/validation/field/FieldValidator.scala
+++ b/src/main/scala/za/co/absa/standardization/validation/field/FieldValidator.scala
@@ -48,9 +48,18 @@ class FieldValidator {
   protected def checkMetadataKey[T: TypeTag](field: TypedStructField,
                                              metadataKey: String,
                                              issueConstructor: String => ValidationIssue = ValidationError.apply): Seq[ValidationIssue] = {
+    /**
+      * Keeps part of the string after last dot. E.g. `scala.Boolean` -> `Boolean`. Does nothing if there is no dot.
+      * @param typeName possibly dot-separated type name
+      * @return simple type name
+      */
+    def simpleTypeName(typeName: String) = {
+      typeName.split("""\.""").last
+    }
+
     def optionToValidationIssueSeq(option: Option[_], typeName: String): Seq[ValidationIssue] = {
       option.map(_ => Nil).getOrElse(
-        Seq(issueConstructor(s"$metadataKey metadata value of field '${field.name}' is not $typeName in String format"))
+        Seq(issueConstructor(s"$metadataKey metadata value of field '${field.name}' is not ${simpleTypeName(typeName)} in String format"))
       )
     }
 
diff --git a/src/test/resources/application.conf b/src/test/resources/application.conf
index 18937ed..c2603e7 100644
--- a/src/test/resources/application.conf
+++ b/src/test/resources/application.conf
@@ -11,4 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-standardization.recordId.generation.strategy="none"
\ No newline at end of file
+standardization.recordId.generation.strategy="none"
+
+standardization.defaultTimestampTimeZone.default="CET"
+standardization.defaultTimestampTimeZone.xml="Africa/Johannesburg"