Diagnosis
The raw data used for your external data analysis consists of asequential data file containing statistical records. The first time theraw data is analyzed, the performance database remembers the firstrecord in the statistics file.
However, the system could not find this record for this re-analysis ofthe data. The file has changed (new raw data added, for example).

Procedure
Determine whether the original sequential data file still contains datayou are interested in.