Create porcedure use iby_ext_bankacct_pub API to upadte banking detial but can not update.

I was Create porcedure use iby_ext_bankacct_pub API to upadte banking detial but can not update.Please view Script the following and help research isue.

Thanks,
Thuy.

CREATE OR REPLACE PROCEDURE VNG_AP_UPDATE_BANK_PROC ( errbuf    out Nocopy varchar2,
                                                  retcode   out Nocopy number  )

---Author: THUYNT
---Create date: 18-05-2012
---Update banking detail cho supplier G8 t? interface Supplier.
AS

l_bank_acct_rec apps.iby_ext_bankacct_pub.extbankacct_rec_type;

out_mesg apps.iby_fndcpt_common_pub.result_rec_type;

l_acct NUMBER;

l_assign apps.iby_fndcpt_setup_pub.pmtinstrassignment_tbl_type;

l_payee_rec apps.iby_disbursement_setup_pub.payeecontext_rec_type;