Sequence Reset

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Imported from previous forum

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Hello,

When reading the Specification there is two different sections that explains how message recovery works.

First:
SESSION PROTOCOL
Message Recovery -
Upon receipt of a Resend Request, the resender can respond in one of three ways:

  1. retransmit the requested messages (in order) with the original sequence numbers and PossDupFlag set
    to “Y” except for the administrative messages (listed below) which are not to be resent and which
    require a SeqReset-GapFill (#2)
  2. issue a SeqReset-GapFill with PossDupFlag set to “Y” message to replace the retransmission of
    administrative and application messages

Then there is the second part that explains the same thing but with diffrent fields filled in:
Sequence Reset (Gap Fill) -

Gap Fill mode
Gap Fill mode is used in response to a Resend Request when one or more messages must be skipped over for the
following reasons:
• During normal resend processing, the sending application may choose not to send a message (e.g. an aged
order).
• During normal resend processing, a number of administrative messages are skipped and not resent (such as
Heart Beats, Test Requests).
Gap Fill mode is indicated by GapFillFlag (tag 123) field = “Y”.

So should you reject a message with GapFillFlag but without the possDupFlag or should you accept it? And what part of the documentation is the “correct” part?