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For on-MTF requests here is a summary of the various Venue's behaviour:

Quote

• FXall - doesn't use this information, so there are no mappings  and you could do what you wanted without any difference in behaviour.
• CNXCurrenex_RFS - if you omit or provide erroneous information, you will find that your quotes are simply dropped silently and do not make it through to the client GUI.
• 360T_TEX - Even with missing or erroneous information, the quote will be published. However if the client attempts to trade, 360T will reject the request. No message is sent back to the Maker at this stage, so from your perspective it just looks as if every RFS times out.
• Bloomberg - Mandatory for MTF, if you omit or provide erroneous values, the quote request will be terminated. So far, only Bloomberg will actually return a meaningful error, here is an example of what we receive:

  8=FIX.4.4|9=0302|35=b|49=BLP|56=MFMA_RFS|34=7|52=20191002-10:12:00|300=8|301=0|131=BLP.RFQ.800254719_MFTA|117=S1570011120.46998|297=5|58=Failed to convert to GPI, ShortCode=Dmitry_xxx DealCode=MFMA roletype=makerExecId   DEAL_CODE: MFMA FIX_SESSION: MFMA_RFSQuoteReqId=BLP.RFQ.800254719_MFTA quoteId=S1570011120.46998 |10=202|

  (Dmitry_002 was the correct EDM value in this case). We will convert this rejection into a QuoteResponse and forward the error message as-is. 

ExecutionReport

• Bloomberg - Mandatory for MTF, if you omit or provide erroneous values, your ExecutionReport will be ignored by Bloomberg: no error is reported, and no ExecutionAck is sent by the venue.