ORA-01410 - invalid rowid

I have a query which intermittently returns the following error:

 @all_resolved_calls
                         siebel.W_ENTLMNT_D T7967,
                                *
ERROR at line 153:
ORA-01410: invalid ROWID

My first suspicion was that I had a corrupted index.
When I ran "analyze table .. validate structure cascade"  to verify that
all entries in the table's indexes point to valid rowids I got no
errors.

My environment is Oracle 8.1.7.4 running on SunOS 5.9.

Where else should I be looking, or should I just blindly rebuild all
four indexes on the table.

Thanks,
Peter Schauss
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http://www.freelists.org/webpage/oracle-l

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