Reject StandardHeader Standard Header Y MsgType = 3 45 RefSeqNum RefSeqNum Y MsgSeqNum of rejected message 371 RefTagID RefTagID N The tag number of the FIX field being referenced. 372 RefMsgType RefMsgType N The MsgType of the FIX message being referenced. 373 SessionRejectReason SessionRejectReason N Code to identify reason for a session-level Reject message. 58 Text Text N Where possible, message to explain reason for rejection 354 EncodedTextLen EncodedTextLen N Must be set if EncodedText field is specified and must immediately precede it. 355 EncodedText EncodedText N Encoded (non-ASCII characters) representation of the Text field in the encoded format specified via the MessageEncoding field. StandardTrailer Standard Trailer Y