Follett VERSION 6.00 - Manual (Page 110)

04/04 110 System Setup
Note: Since filter rules prevent records from being sent to the union catalog,
reports run at the union catalog may not exactly reflect the member's
collection.
3. From the Error Logging tab, you specify the types of errors that should be
logged and where to log them. Where you choose to log the errors depends
on the availability and location of your district's technical personnel:
Errors are logged at the specified Follett Data
Exchange Server in the Windows NT/2000 Event
Viewer's Application Log (see the Follett Data
Exchange Guide (fscdx.pdf)).
Note: If one Follett Data Exchange Server
supports both the union catalog and the member,
select only one location.
If communications fail, any pending transactions
will simply wait until communications resume.
Error messages usually indicate a transaction
that couldn't be completed (e.g., the record was
in use by the partnering database).
Data Exchange will automatically attempt to
resend these transactions in the next batch of
updates.