| Tag | Field Name | Req'd | Comments | 
                           
                              | <MessageHeader> | Y | MsgType <35> = AA | 
                           
                              | 320 | SecurityReqID | Y |  | 
                           
                              | 322 | SecurityResponseID | Y | Identifier for the Derivative Security List <AA> message
                                  | 
                           
                              | 560 | SecurityRequestResult | Y | Result of the Security Request identified by SecurityReqID <320>
                                    
                                  | 
                           
                              | Component Block - <UnderlyingInstrument> | N | Underlying security for which derivatives are being returned | 
                           
                              | 393 | TotNoRelatedSym | N | Used to indicate if the total number of securities being returned for this request. Used in the event that message fragmentation
                                    is required.
                                  | 
                           
                              | 893 | LastFragment | N | Indicates if this message in a fragmented response | 
                           
                              | 146 | NoRelatedSym | N | Specifies the number of repeating symbols (instruments) specified | 
                           
                              | => | Component Block - <Instrument> | N | Insert here the set of "<Instrument>" (symbology) fields of the requested Security | 
                           
                              | => | 15 | Currency | N |  | 
                           
                              | => | 827 | ExpirationCycle | N |  | 
                           
                              | => | Component Block - <InstrumentExtension> | N | Insert here the set of "<InstrumentExtension>" fields
                                  | 
                           
                              | => | 555 | NoLegs | N | Number of legs that make up the Security | 
                           
                              | => | => | Component Block - <InstrumentLeg> | N | Insert here the set of "<InstrumentLeg>" (leg symbology) fields
                                  Required if NoLegs <555> > 0
                                  | 
                           
                              | => | 336 | TradingSessionID | N |  | 
                           
                              | => | 625 | TradingSessionSubID | N |  | 
                           
                              | => | 58 | Text | N | Comment, instructions, or other identifying information. | 
                           
                              | => | 354 | EncodedTextLen | N | Must be set if EncodedText <355> field is specified and must immediately precede it.
                                  | 
                           
                              | => | 355 | EncodedText | N | Encoded (non-ASCII characters) representation of the Text <58> field in the encoded format specified via the MessageEncoding <347> field.
                                  | 
                           
                              | <MessageTrailer> | Y |   |