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MarketDataRequestReject (35=Y)

The Market Data Request Reject is used when the broker cannot honor the Market Data Request (35=V), due to business or technical reasons. Brokers may choose to limit various parameters, such as the size of requests, whether just the top of book or the entire book may be displayed, and whether Full or Incremental updates must be used.
Rejection received
Schema
    MDReqID Tag 262 (string)required

    Must refer to the MDReqID (262) of the request.

    MDReqRejReason Tag 281 (string)

    Reject reason

    NoAltMDSource Tag 816 (integer)

    Possible values: >= 1

    Number of market data source

    AltMDSourceGrp object
    AltMDSourceID Tag 817 (string)

    Session layer source for market data (For the standard FIX session layer, this would be the TargetCompID (56) where market data can be obtained).

    Text Tag 58 (string)
    EncodedTextLen Tag 354 (integer)

    Must be set if EncodedText (355) field is specified and must immediately precede it.

    EncodedText Tag 355 (string)

    Encoded (non-ASCII characters) representation of the Text (58) field in the encoded format specified via the MessageEncoding (347) field.

    MsgType Tag 35 (string)

    Possible values: [Y]

    Message Type = Y (Market Data Request Reject)

    AltMDSourceID