[This message was posted by Xavier Bruyet of Ullink <[email protected]> 
to the "4.0 Session" discussion forum at http://fixprotocol.org/discuss/12. You 
can reply to it on-line at http://fixprotocol.org/discuss/read/103da0e2 - 
PLEASE DO NOT REPLY BY MAIL.]

> > > > Hi all,
> > > >
> > > > What should be the value of LastMsgSeqNumProcessed (369) when the
> > > > session replies to a session message (logon, logout, resend
> > > > request, test request)?
> > > >
> > > > For example, if the session receives a logon message (34=42),
> > > > should my logon reply specify 369=42 or 369=41? In other words, do
> > > > I consider that the received logon message has been processed when
> > > > I reply to it even if I may send a resend request just after?
> > > >
> > > > Thank you in advance for any clarification,
> > > >
> > > > Xavier.
> > >
> > > Happy new year Xavier,
> > >
> > > Firstly, let me say that this question definitely doesn't belong in
> > > the FIX.4.0 Session forum as this tag doesn't exist in the FIX.4.0
> > > specification. It was introduced with FIX.4.2.
> > >
> > > As to your question, in the case of your example, that would be
> > > 369=42. The answer would be the same for a ResendRequest that
> > > immediately follows. My take on the issue is that the Logon message
> > > is "being processed" at a minimum or else you would not be sending a
> > > Logon response.
> > >
> > > Thanks
> > >
> > > JohnP
> >
> > Oh yes, sorry to have posted in the bad forum. If someone can move the
> > thread to the right one...
> >
> > Thank you for your answer. About the synchronization process, is it to
> > say that every resent messages populate the tag 369 with the sequence
> > number of the resend request?
> >
> > Happy new year of course :)
> 
> Yes, I believe that every message resent as a result of receiving a
> ResendRequest should have LastMsgSeqNumProcessed = MsgSeqNum from the
> ResendRequest message.
> 
> JohnP

Interesting. It's not what we currently do actually but why not... Thank you 
again. Other views are welcome.

Xavier.

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