# Market Data Request Reject <Y>

#

### Fields

| Tag | Name                                                                       | Req | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| --- | -------------------------------------------------------------------------- | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|     | [Standard Header](/trading/fix/overview/standard-header)                           | Y   | [MsgType](https://www.onixs.biz/fix-dictionary/4.4/msgs_by_msg_type.html) = `Y`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| 262 | [MDReqID](https://www.onixs.biz/fix-dictionary/4.4/tagNum_262.html)        | Y   | Unique identifier of the market data request being rejected.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| 281 | [MDReqRejReason](https://www.onixs.biz/fix-dictionary/4.4/tagNum_281.html) | N   | Reason why [Market Data Request `<V>`](/trading/fix/market-data/exchange-bound-messages/market-data-request) was rejected.<br /><br />Valid values:<br />`0 = Unknown Symbol`<br />`1` = Duplicate [MDReqID `<262>`](https://www.onixs.biz/fix-dictionary/4.4/tagNum_262.html)<br />`4` = Unsupported [SubscriptionRequestType `<263>`](https://www.onixs.biz/fix-dictionary/4.4/tagNum_263.html)<br />`5` = Unsupported [MarketDepth `<264>`](https://www.onixs.biz/fix-dictionary/4.4/tagNum_264.html)<br />`8` = Unsupported [MDEntryType `<269>`](https://www.onixs.biz/fix-dictionary/4.4/tagNum_269.html) |
|     | [Standard Trailer](/trading/fix/overview/standard-trailer)                         | Y   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |