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ORA-14450 error with ALTER TABLE

When executing (from SQL*Plus) ALTER TABLE event_work MODIFY(user_pid VARCHAR2(22 BYTE)) we get this error: "ORA-14450: attempt to access a transactional temp table already in use."

When executing (from SQL*Plus) ALTER TABLE event_work MODIFY(user_pid VARCHAR2(22 BYTE)) we get this error: "ORA-14450: attempt to access a transactional temp table already in use." My Oracle release is 9.2.0.5.0.
As the ORA-14450 error states, you are attempting an operation on a temp table that is in use. You can try again at a later time to see if you can catch a period when no one is using the table. Otherwise, schedule this operation during a DBA maintentance window.

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