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• 360T - 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.

Also, at the risk of me stating the obvious, these details are required on-MTF only  - if OFF, or testing SEF then, again any values you provide will be ignored.

There can only be one EDM, one IDM. The two may be the same, but there cannot be multiple of each. The EDM and IDM values provided must be previously registered by the market participant and are used to unambiguously identify the one person considered to have primary responsibility for the transaction in each capacity.