Resend Request with EndSeqNo too high: how to react?

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Imported from previous forum

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[ original email was from John Prewett - jprewett@lavatrading.com ]
This is a re-posting of a previously unanswered question from Paul van Diepen on 7/16/2001 which I hope will elicit greater response.

>How should a FIX engine A react to the following situation:
>A Sends a new message with MsgSeqNum=100
>B Sends a Resend Request with BeginSeqNo=90 and EndSeqNo=110

The simple question is:
How should A respond to B’s ResendRequest?

Thanks in advance for your help.

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[ original email was from Dean Kauffman - dean.kauffman@tradeweb.com ]
If B is truly expecting seq 110 when it receives 100 from A, B should terminate the session. But if B choses to ignore the condition and request resend of an impossible range, A should terminate the session. If A does respond with messages 90-100 and GapFill 101-110 then it is guilty of "recovering" a session containing 10 irretrievable messages.

> This is a re-posting of a previously unanswered question from Paul van Diepen on 7/16/2001 which I hope will elicit greater response.
>
> >How should a FIX engine A react to the following situation:
> >A Sends a new message with MsgSeqNum=100
> >B Sends a Resend Request with BeginSeqNo=90 and EndSeqNo=110
>
> The simple question is:
> How should A respond to B’s ResendRequest?
>
> Thanks in advance for your help.
>