{{Quickfixn}} How to prevent rejection of message missing an *optional* field.

[Manuel Lopez]

Grant,

Thanks, you are right, I figured it out soon after.  It's the error message
that is a little confusing there--I can see the logic of it but it's only
that a non-existent tag has been accessed, not that the data dictionary or
the spec (or any one) requires it to be in the message.

Manuel



> DO NOT set UseDataDictionary to "N" !!!   It won't fix your problem, and
> it'll break any repeating groups also.
>
> The engine is operating correctly.  The problem is your code.  I'm guessing
> you're calling "message.LastPx" (or "GetField(31)" or whatever) without
> actually checking that LastPx is in the message.
>
> If you attempt to extract a field and it's not set, the engine assumes
> that, since you expected the field to be there, it was conditionally
> required.  (Not *always* required, but conditionally required, which means
> it's only required in certain circumstances that the engine can't know.)
>
> That is today, the engine is trusting that *your* code is correct, and that
> the other party has violated *your* requirement.
>
> It appears that you want 31 to be completely optional.  In that case, you
> must check to see if it's present before you extract it, e.g.
>
>     if(message.IsSetLastPx)
>         lastPx = message.LastPx.Value;  // or whatever
>
> (Pardon me if I didn't get the function names exactly right.)
>
>
>
> On Fri, Jan 10, 2014 at 6:21 PM, Manuel Lopez <lopez.post at gmail.com>
> wrote:
>
> > I think I'll set UseDataDictionary to "N."
> >
> >
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>
> --
> Grant Birchmeier
> *Connamara Systems, LLC*
> *Made-To-Measure Trading Solutions.*
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