Calling an Oracle Function

Hi,
i'm trying to call a Function from a BPEL Process
I have the following TYPE on the Oracle DB
BALANCETYPE AS OBJECT
     "ACCT_EXT_ID" VARCHAR2(144),
     "TRANS_TYPE" VARCHAR2(240),
     "TRANS_REFERENCE" VARCHAR2(180),
"FROM_DATE" VARCHAR2(15),
     "TO_DATE" VARCHAR2(15),
     "STATEMENT_DATE" VARCHAR2(15),
     "PAYMENT_DUE_DATE" VARCHAR2(15),
     "DEBIT_AMOUNT" NUMBER(18,4),
     "CREDIT_AMOUNT" NUMBER(18,4),
     "AMOUNT" NUMBER(18,4),
     "BALANCE_AMOUNT" NUMBER(18,4),
     "ORIG_TRANS_REF" VARCHAR2(180),
     "PAYMENT_TRACKING_ID" NUMBER(10,0)
I have a convertion function
create or replace FUNCTION fnc_convertBalance (cbalance SYS_REFCURSOR,collname VARCHAR2,objname VARCHAR2) RETURN BALANCE
AS
     LANGUAGE JAVA
     NAME 'ResultSetConverter.convert(java.sql.ResultSet, java.lang.String, java.lang.String) return java.sql.Array';
And i have a my own function that calls the original SP
FUNCTION bpm_art_rpt_account_balance(v_nif IN VARCHAR2,
v_phone IN VARCHAR2,
v_acct_ext_id IN VARCHAR2,
v_acct_no IN NUMERIC,
v_invoice_ref IN VARCHAR2)
RETURN BALANCE
IS
     cursor_billing SYS_REFCURSOR;
     balanceobjct BALANCE := NULL;
BEGIN
     art_rpt_account_balance(v_nif,v_phone,v_acct_ext_id,v_acct_no,v_invoice_ref,cursor_billing);
     balanceobjct := fnc_convertBalance(cursor_billing, 'BALANCE','BALANCETYPE');
return balanceobjct;
END bpm_art_rpt_account_balance;
When i call this function from the Oracle DB with a DB GUI everything works fine, but when i call it from a BPEL Process i get the following error
ORA-00932: inconsistent datatypes: expected OUT Conversion failed got ORA-06512: at "ARBOR.FNC_CONVERTBALANCE", line 0 ORA-06512: at "ARBOR.BPM_ART_RPT_ACCOUNT_BALANCE", line 12 ORA-06512: at line 1
Any ideas ?
Thanks

Note that ResultSetConverter.convert(java.sql.ResultSet, java.lang.String, java.lang.String) returns a java.sql.Array. I don't know what BALANCE is (you left out its definition), but it appears to be a single object (i.e. a java.sql.Struct), which is wrong. The purpose of the ResultSetConverter API is to convert a Ref Cursor into something the adapter can handle (i.e. a java.sql.Array), which you may then use to process the array elements.

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