Sql stored procedure

i created a stored procedure to receive some input parameter and return an output value.

but i'm getting "ORA-01858: a non-numeric character was found where a numeric was expected"

and i can't get where that error is coming from.

create or replace PROCEDURE STAN_INST 
(
  INP_BRA_CODE IN NUMBER 
, INP_CUS_NUM IN NUMBER 
, INP_CUR_CODE IN NUMBER 
, INP_LED_CODE IN NUMBER 
, INP_SUB_ACCT_CODE IN NUMBER 
, INP_PAY_TYPE IN NUMBER 
, INP_PAY_FREQ IN NUMBER 
, INP_FST_PAY_DATE IN DATE  --ddmmyyyy 
, INP_FST_PAY_AMT IN NUMBER 
, INP_LAS_PAY_DATE IN DATE 
, INP_REMARKS IN VARCHAR2
, INP_TELL_ID IN NUMBER
, INP_CRE_ACCT IN VARCHAR2
, RETURN_STATUS IN OUT NUMBER
) 
IS 
     d_time varchar2(8);
     N_SEQ  NUMBER;
     N_date DATE;

BEGIN

        RETURN_STATUS  := 0;

  /*
  select lpad(&bra_code, 4, '0')||lpad(&cus_num, 7, '0')||lpad(&cur_code, 3, '0')||lpad(&led_code, 4, '0')||lpad(&sub_acct_code, 3, '0')
from dual
  */


SELECT NVL(MAX(INST_SEQ), 0) + 1
  INTO N_SEQ
  FROM stan_ins
WHERE BRA_CODE = INP_BRA_CODE
   AND CUS_NUM = INP_CUS_NUM
   AND CUR_CODE = INP_CUR_CODE
   AND LED_CODE = INP_LED_CODE
   AND SUB_ACCT_CODE = INP_SUB_ACCT_CODE;

select to_char(sysdate, 'hh24miss') into d_time from dual;

select trunc(sysdate) into N_date from dual;



INSERT INTO STAN_INS

  (BRA_CODE,
   CUS_NUM,
   CUR_CODE,
   LED_CODE,
   SUB_ACCT_CODE,
   INST_SEQ,
   INST_DATE,
   TELL_ID,
   INST_TYPE,
   PAY_TYPE,
   PAY_MODE,
   PAY_FREQ,
   FST_PAY_DATE,
   FST_PAY_AMT,
   LAS_PAY_DATE,
   TOT_AMT,
   NUM_OF_REM_PAY,
   PAY_AMT,
   COM_AMT,
   UP_TO_DATE_AMT,
   UPP_LOW_LIM,
   LAS_TRA_DATE,
   CRE_ACCT,
   DEB_ACCT,
   BANK_CODE,
   PAY_CUR_CODE,
   REMARKS,
   OVDN_FLAG,
   DR_CR_REMARKS,
   UPD_TIME)

VALUES
  (INP_BRA_CODE,
   INP_CUS_NUM,
   INP_CUR_CODE,
   INP_LED_CODE,
   INP_SUB_ACCT_CODE,
   N_SEQ,
   N_date,
   INP_TELL_ID,
   1,
   INP_PAY_TYPE,
   2,
   INP_PAY_FREQ,
   to_date(INP_FST_PAY_DATE, 'ddmmyyyy'),
   INP_FST_PAY_AMT,
   INP_LAS_PAY_DATE,
   0,
   1,
   0,
   0,
   0,
   0,
   N_date,
   INP_CRE_ACCT,
   0,
   100,
   1,
   INP_REMARKS,
   1,
   INP_REMARKS,
   d_time
   );

COMMIT;

END STAN_INST;

<pre>
INP_BRA_CODE	NUMBER	IN	202
INP_CUS_NUM	NUMBER	IN	13234
INP_CUR_CODE	NUMBER	IN	1
INP_LED_CODE	NUMBER	IN	3
INP_SUB_ACCT	NUMBER	IN	0
INP_PAY_TYPE	NUMBER	IN	2
INP_PAY_FREQ	NUMBER	IN	5
INP_PAY_DATE	DATE	IN	2020-02-11
INP_PAY_AMT	NUMBER	IN	1200
INP_PAY_DATE	DATE	IN	2020-02-11
INP_REMARKS	VARCHAR2(200)	IN	STAN INT
INP_TELL_ID	NUMBER	IN	9
INP_CRE_ACCT	VARCHAR2(200)	IN	020200132340010003018