Here is information regarding Invalid ISA Element REPETITION SEP
Interchange Control Structures
Typically, the term “interchange” connotes the ISA/IEA envelope that
is transmitted
between trading/business partners. Interchange control is achieved
through
several “control” components. The interchange control number is
contained in
data element ISA13 of the ISA segment. The identical control number
must also
occur in data element 02 of the IEA segment. Most commercial
translation software
products will verify that these two fields are identical. In most
translation
software products, if these fields are different the interchange will
be “suspended”
in error.
There are many other features of the ISA segment that are used for
control measures.
For instance, the ISA segment contains data elements such as
authorization
information, security information, sender identification, and receiver
identification
that can be used for control purposes. These data elements are agreed
upon
by the trading partners prior to transmission and are contained in the
written trading
partner agreement. The interchange date and time data elements as well
as
the interchange control number within the ISA segment are used for
debugging
purposes when there is a problem with the transmission or the
interchange.
Data Element ISA12, Interchange Control Version Number, indicates the
version
of the ISA/IEA envelope. The ISA12 does not indicate the version of
the transaction
set that is being transmitted but rather the envelope that
encapsulates the
transaction. An Interchange Acknowledgment can be denoted through data
element
ISA14. The acknowledgment that would be sent in reply to a “yes”
condition
in data element ISA14 would be the TA1 segment. Data element ISA15,
Test Indicator,
is used between trading partners to indicate that the transmission is
in a
“test” or “production” mode. This becomes significant when the
production phase
of the project is to commence. Data element ISA16, Subelement
Separator, is
used by the translator for interpretation of composite data elements.
The ending component of the interchange or ISA/IEA envelope is the IEA
segment.
Data element IEA01 indicates the number of functional groups that are
included
within the interchange. In most commercial translation software
products,
an aggregate count of functional groups is kept while interpreting the
interchange.
This count is then verified with data element IEA01. If there is a
discrepancy,
in most commercial products, the interchange is suspended. The other
data
element in the IEA segment is IEA02 which is referenced above.
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