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I have a logical file uniquely keyed on ITEM and WAREHOUSE.
I have found an (incorrect) program that does a CHAIN to this logical
using just ITEM. (The assumption may have been that it would get the
lowest WAREHOUSE which is where most stock is, but it is old code and I
can't ask anyone.)
I believe it sometimes gets a record that isn't the lowest WAREHOUSE and
ITEMS sometimes vanish from a report because there is no stock in this
warehouse.
Some eagle eyed person found items missing from a report from last year.
We restored the PF and the LF from a backup tape to another library,
reran the report, and the missing items correctly turned up.
I believe that there is no guarantee that if you do a CHAIN on ITEM that
you are guaranteed to get the record with the lowest value of WAREHOUSE
and that randomly we get another record.
Others are skeptical that I have found the cause, but it is a
complicated program stack and we haven't found any other reason.
Question 1: Am I on solid ground with my belief?
Question 2: Does any one know of any documentation on this subject?
Thanks, Sam
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