The size of a record in the table you are exporting is greater than 4K. When exporting to the DSNTIAUL format, each record must fit within a 4K page size. If the record contains one or more columns of type LONG VARCHAR, the data in those columns is truncated if possible to make the record fit into 4K. However, if the other column lengths are large enough, this won't reduce the size sufficiently.
Restriction: This topic applies to Windows environments only.