[This message was posted by Hanno Klein of Deutsche Börse Systems 
<[email protected]> to the "General Q/A" discussion forum at 
http://fixprotocol.org/discuss/22. You can reply to it on-line at 
http://fixprotocol.org/discuss/read/995046de - PLEASE DO NOT REPLY BY MAIL.]

Tags 207 and 100 have different meanings/semantics. 207 SecurityExchange 
further identifies the instrument. If you change it you are saying that you 
want to trade a different instrument with the same order, does not really make 
sense.

100 ExDestination says where you want the order to execute. Changing it changes 
the marketplace. Seems strange to allow a modification of this value as the 
marketplace itself will certainly not accept it (it would have to "route" your 
order there, can't really imagine that). A broker in between could obviously 
have tried your order in one place and then in another, informing you about the 
change. In my view, that would require you to have left tag 100 open, leaving 
it up to the recipient to choose the proper marketplace.

If you send tag 100, there should be no unsolicited modification of its value. 
You should be the only (if allowed) to change it. Typically, it is not allowed 
and you need to cancel the order and re-issue a new one.

Regards,
Hanno.

> Hi, In 35=D, 207=XX, 100=XX. Then there is an Unsolicited Modification
> (Exchange Modification), to change the exchange to 'YY'. Should this
> change will be taken care in Tag#207 and Tag#100 or ignored?? As in
> FIX4.2, Exchange Modification is not allowed.
> 
> 1. If taken care, will it effects to both the Tags or only tag 100. Then
>    in fills (39=1 or 39=2) Tag#30 will contain which value - XX or YY?
> 
> 2. If ignored, Tag#100 and Tag#207 will remain same i.e XX. Then in
>    fills (39=1 or 39=2) Tag#30 will contain which value - XX or YY?
> 
> Thanks in advance. Sachin.


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