Jim,
I'll
take a shot at this, but others are more knowledgeable than
I.
The
TA1 is only used if requested by the ISA segment, element
ISA14,
value of 1. The ability of the TA1 segment is limited
as
you
have already seen.
It is
meant as a "I got your message" and to indicate if you accept
it,
accept it but contains errors, or rejected
it. True the TA1 can
send
back an error code via element TA105, but this is intended as
an
transmission envelope error indicator. If you accepted
the message
and it
contained functional errors that did not preclude you from
translating the file, these errors would
be reported back better via
the
997.
If you
read some of the IGs you will also see that the TA1 is
intended
to be
used in a "real-time" exchange of information, where the 997
is
intended to be more of a batching exchange of information. I
don't
know
if this is actually been worked out yet, since all IGs (but the
TA1)
including the 997, is wrapped in a ISA/ISE
envelope. Therefore, in
theory, a 997 could ask for a TA1 in response.
Also some of the guides
(e.g.
837I) state they expect a 997 to be the first
response from a
receiver.
So
which do you use... confusing... yup! I hope others will shed better
light
on this issue too.
BCY Brian C. Young
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