8.1.7: ORA-01410 in PL/SQL but not SQL*Plus

Question

This has been driving me crazy, and a search here and in comp.databases.oracle didn't turn up any solutions.
When the following code is part of a stored procedure, it fails with ORA-01410 (Invalid ROWID). It executes perfectly from SQL*Plus, I've verified that TMP_TASK_DATA contains data, and the query clearly specifies a ROWID.
As noted in the subject, this occurs on 8.1.7. TMP_TASK_DATA and TMP_TASK_RETRIEVAL are both global temp tables. I don't currently have access to Metalink, so was hoping that someone has run across this and has some hints.
Thx,
(query edited to limit "IN" list):
        INSERT  INTO TMP_TASK_RETRIEVAL
                (TASK_ID, TD_ROWID, SORT_ORDER)
        SELECT  TASK_ID, TD_ROWID, ROWNUM
        FROM    (
                SELECT  TASK_ID, TD_ROWID
                FROM    (
                        SELECT  TASK_ID,
                                ROWID                                   as TD_ROWID,
                                SF_GET_PRIORITY(TASK_TYPE, 1 )          as PRIORITY_COMM,
                                COMPLETED_TIME                          as FINISH_TIME,
                                FIRST_READY_TIME                        as QUEUE_TIME
                        FROM    TMP_TASK_DATA
                        WHERE   USER_NUMBER = v_USER_NUM
                        AND     TASK_TYPE in
                                'AAAA', 'BBBB', 'CCCC'
                ORDER BY
                        PRIORITY_COMM,
                        decode(PRIORITY_COMM, 10, FINISH_TIME, QUEUE_TIME)
                );

Answer 1

Thanks for the info. It turned out that I was wrong about removing the PL/SQL variable from the query; either that, or the error occurs at arbitrary times.
As best I can tell, a ROWID simply can't be passed between nested inline views, so I reduced them to one level (which means that I have to run the function twice in the ORDER BY, rather than once in the nested select).