I try to extract the Historical reference for certain RICs. It works with ChainRICs but when I enter a RIC, there is an error of invalid identifier. 
See the code example
 string[] requestedFieldNames = {
  "RIC",
  "RIC Root",  
  "Expiration Date"};
  //Create the request
  var extractionRequest = new HistoricalReferenceExtractionRequest()
  {  IdentifierList = new InstrumentIdentifierList()
  {  InstrumentIdentifiers = new[] { new InstrumentIdentifier { IdentifierType = IdentifierType.Ric, Identifier = "HOZ5" } }
  },
  Condition = new HistoricalReferenceCondition()
  {  ReportDateRangeType = ReportDateRangeType.Range,
  //QueryStartDate = new DateTimeOffset(new DateTime(2014, 1, 1)),
  //QueryEndDate = new DateTimeOffset(new DateTime(2014, 1, 31))
  QueryStartDate = new DateTimeOffset(new DateTime(2015, 12, 1)),
  QueryEndDate = new DateTimeOffset(new DateTime(2015, 12, 4))
  },
  ContentFieldNames = requestedFieldNames
  };
  //Extract - NOTE: If the extraction request takes more than 30 seconds the async mechansim will be used.  See Key Mechanisms 
  var extractionResult = ExtractionsContext.ExtractWithNotes(extractionRequest);
  var extractedRows = extractionResult.Contents;