Does anybody use tag 57 "TargetSubID" and know what it means?

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Imported from previous forum

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[ original email was from Francesc Prats - fprats@meff.com ]
> In our FIX specs, we use this tag in this way:

a) In messages sent to MEFF: Identifies the MEFF market associated with the FIX session.

b) In messages sent by MEFF: Is the trader identification associated with the FIX session.
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[ original email was from Himanshu Sharma - himanshu.sharma@schwab.com ]
Buy-side can also specify name of Trader(Mkt Maker) where they want the order to go.
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