Rewrite the predicate into an equivalent form to take advantage of indices

Hi all,
I'm working on a tuning project on Oracle 10.2.0.5 for HPUX.
While taking an ADDM, I see the following:
The predicate RTRIM("IC_TIPOS_ASIENTOS"."TIP_ASIENTO")=RTRIM(:B1) used at line ID 2 of the execution plan contains an expression on indexed column "TIP_ASIENTO". This expression prevents the optimizer from selecting indices on table "SCHEMA"."IC_TIPOS_ASIENTOS".
Rewrite the predicate into an equivalent form to take advantage of indices. Alternatively, create a function-based index on the expression.
The query is:
select count(*) into :b0 from IC_TIPOS_ASIENTOS where (((((RTRIM(CUENTA_SGC)=rtrim(:b1) or NVL(RTRIM(CUENTA_SGC), ' ')=' ') and RTRIM(TIP_ASIENTO)=rtrim(:b2)) and (RTRIM(TIP_TARIFA)=rtrim(:b3) or RTRIM(TIP_TARIFA)='T')) and (RTRIM(EST_ORIGEN)=rtrim(:b4) or EST_ORIGEN='0999BGRTYP')) and (CO_GRUPO_CON=:b5 or CO_GRUPO_CON=0))
_Does it mean that in order to take advantange of the indexes I should create an funcion-based index of the expression RTRIM(TIP_ASIENTO)?_
I cannot change the code of the application, only indexes.
Thanks a lot.
Regards,

I performed an autotrace, and the index is being used. I didn't create any new index so far.
Take a look:
Execution Plan
Plan hash value: 1322405988
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 27 | 4 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 27 | | |
|* 2 | INDEX FAST FULL SCAN| IC_TIPOS_ASIENTOS_I01 | 1 | 27 | 4 (0)| 00:00:01 |
Predicate Information (identified by operation id):
2 - filter("CO_GRUPO_CON"=0 AND RTRIM("TIP_ASIENTO")='TJ035' AND
"EST_ORIGEN"='0999BGRTYP' AND (RTRIM("TIP_TARIFA")='G' OR RTRIM("TIP_TARIFA")='T') AND
(RTRIM("CUENTA_SGC")='VA675' OR NVL(RTRIM("CUENTA_SGC"),' ')=' '))
Although RTRIM is used the index is taken into account to solve the query.
If I remove the RTRIM, execution plan is the same and there's no gain.
So, ADDM is wrong?
What does it say that it cannot take advantage of indexes when thay are actually used ?
Thanks

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