datetime validation

src/main/scala/org/opengroup/osdu/production/common/WriteBackServiceMessages.scala

@@ -33,7 +33,7 @@ object WriteBackServiceMessages {
   val notFoundEntityKey = "EntityKey - % doesn't exist"
   val invalidDataType = "Invalid Point value - % for Data Type - % in request"
   val invalidDataTypeNotSet = "Invalid Point value - % for Data Type - % in request, input is not a SET"
-  val invalidDataTypeISODateTime = "Invalid Point value - % for Data Type - % in request, input is not ISO-8601 format"
+  val invalidDataTypeISODateTime = "Invalid Point value - % for Data Type - % in request, input is not in ISO-8601 format"
   val invalidDataTypePDM = "Invalid Data Type - % of Point value - % for given Property Descriptor in request"
   val invalidUOM = "Invalid Unit of measurement - % for given Property Descriptor in request"
   val multipleDataFields = "Invalid request - contains multiple data fields only one of %s fields is required"