DECODE Function In Reports 3.0

Question

Hi,
When I use the decode function in a query (Reports 3.0.5.8.0) I receive an error message "Bind Variable Does Not Exist" (ORA-1006). When I remove the decode function from the query, the query compiles fine. All table and column references are existing.
Also, the same query runs perfectly fine from SQL*Plus. The OS is Win 2000, SP2
Any idea if this is a bug? Is there any way out? Do get back as this is very urgent.
The database is Oracle 8i Ent, 8.1.7 on AIX 4.3
The query is as follows:
SELECT NAM_CMP , COD_CMP , COD_CMP_REG ,
DECODE(FLG_CMP_SHP,'Y','S/',' /') || DECODE(FLG_CMP_AGT,'Y','A/',' /') || DECODE(FLG_CMP_CNE,'Y','C',' ') TYPE ,
DES_ADD_STT , DES_ADD_PLC , DES_ADD_STA , DES_ADD_POS , COD_CTY , COD_cou_iso ,
DAT_LST_AST , DAT_LST_UPD,
cod_dcl_box_num, decode(cod_imp_chg_way,'C','CASH','CREDIT') cod_imp_chg_way,
decode(cod_imp_cre_way,'W','WEEKLY','F','FIFTEEN DAYS','M','MONTHLY', NULL) cod_imp_cre_way,
decode(flg_imp_prn_inv, 'N', null, flg_imp_prn_inv) flg_imp_prn_inv,
cod_bro_box_num, decode(cod_exp_chg_way,'C','CASH','CREDIT') cod_exp_chg_way,
decode(cod_exp_cre_way,'W','WEEKLY','F','FIFTEEN DAYS','M','MONTHLY', NULL) cod_exp_cre_way,
decode(flg_exp_prn_inv, 'N', null, flg_exp_prn_inv) flg_exp_prn_inv
FROM CMP
where dat_can is null

Answer 1

Try TO_CHAR(NULL) instead of NULL in all DECODE functions.
For example:
decode(cod_imp_cre_way,'W','WEEKLY','F','FIFTEEN DAYS','M','MONTHLY', TO_CHAR(NULL))
instead of:
decode(cod_imp_cre_way,'W','WEEKLY','F','FIFTEEN DAYS','M','MONTHLY', NULL).