[This message was posted by Jue Wang of Pershing <[email protected]> to the 
"General Q/A" discussion forum at http://fixprotocol.org/discuss/22. You can 
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> NYSE is apparently using a user-defined field (9487 RoutingInstruction)
> with a value of "CO". I do not see the routing element of an order that
> is valid for the imbalance of the closing auction only but as they use a
> UDF, it is outside of the standard anyway.
> 
> NYSE permits only 0=Day for 59 TimeInForce of closing offset orders. I
> would argue that 7=At the Close is a better value. I believe NYSE
> currently uses TimeInForce=2=At the Opening for the opening auction and
> TimeInForce=0=Day + OrdType (40) for the closing auction with OrdType
> values 5=Market on Close and A=On Close which are no longer used. The
> difference in approach for opening and closing auctions does not seem
> intuitive and is only supported in older FIX versions. It was deprecated
> with FIX 4.3 in Aug 2001.
> 
> In my view, the standard approach to orders only allowed to match the
> opposite side of the imbalance during the closing auction would be to
> use TimeInForce=7=At the Close together with tag 18 ExecInst=i=Imbalance
> only. This was added to FIX 5.0 and is formally not part of FIX 4.2 used
> by NYSE. However, it is still better to use a standard
> message/field/value from a higher FIX version than to go for a user-
> defined field.
> 
> > i think i found the answer i was looking for. see the attached link -
> > http://www.nyse.com/pdfs/ClosingOffsetOrder_20091116.pdf
> > > Could you post a short description of it? Thanks.
> > >
> > > > Has there been any industry consensus as to what fix tags will be
> > > > used to support this new NYSE Closing offset order type?


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