After Update Trigger not triggering for first update

Question

Hi All,
I have written a Trigger on AP_SUPPLIERS table to update AP_SUPPLIER_SITES_ALL when payment priority gets updated on AP_SUPPLIERS table. Trigger calls a pragma autonomous procedure after update happens, and updates sites table. We are on R12 (12.1.3) with  DB 11.2.0.3.0
Somehow this is not working for the first update, after that for every update it is working. Any idea why this might be happening?
Trigger Code: 
CREATE OR REPLACE TRIGGER XX_AP_SUPPLIER_SIT_UPD_SYNC
AFTER UPDATE
ON AP.AP_SUPPLIERS
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
DECLARE
l_vendor_id     NUMBER;
l_paym_priority NUMBER;
BEGIN
   XX_AP_SUPSITE_UPDATE(:NEW.PAYMENT_PRIORITY, :NEW.VENDOR_ID);
   EXCEPTION
     WHEN OTHERS THEN
       RAISE;
END XX_AP_SUPPLIER_SIT_UPD_SYNC;
Procedure Code:
CREATE OR REPLACE PROCEDURE APPS.XX_AP_SUPSITE_UPDATE (p_payment_priority  IN  NUMBER,p_vendor_id IN NUMBER) AS
  PRAGMA AUTONOMOUS_TRANSACTION;
  ex_custom EXCEPTION;
  PRAGMA EXCEPTION_INIT( ex_custom, -20001 ); 
BEGIN
  UPDATE AP_SUPPLIER_SITES_ALL
  SET PAYMENT_PRIORITY =p_payment_priority
  WHERE VENDOR_ID = p_vendor_id;
  COMMIT;
EXCEPTION 
WHEN OTHERS THEN
    raise_application_error( -20001, 'Error while updating payment priority on Site '||SQLERRM );
END XX_AP_SUPSITE_UPDATE;

Answer 1

Thanks for your replies Saubhik/VT,
now my trigger is compiled. but is not triggering. pl help me to resolve .....
create or replace
TRIGGER AUDIT_DEV.trg2
AFTER DELETE OR UPDATE OF EMP_STATUS ON AUDIT_DEV.AUDIT_PERSONS
FOR EACH ROW
declare
OSUSER varchar2(30);
     MACHINE varchar2(30);
     logon_time date;
db_user varchar2(30);
USERNAME VARCHAR2(30);
EMP_USER_MODIFIED AUDIT_PERSONS.EMP_USER_MODIFIED%TYPE;
     EMP_DATE_MODIFIED AUDIT_PERSONS.EMP_DATE_MODIFIED%TYPE;
     EMP_SK AUDIT_PERSONS.EMP_SK%TYPE;
     EMP_ID AUDIT_PERSONS.EMP_ID%TYPE;
     EMP_NAME AUDIT_PERSONS.EMP_NAME%TYPE;
EMP_RESIGNATION_DATE AUDIT_PERSONS.EMP_RESIGNATION_DATE%TYPE;
BEGIN
select     username,osuser,machine,logon_time into db_user,osuser,machine,logon_time from v$session where sid=(select sid from v$mystat where rownum=1);
INSERT INTO AUDIT_DEV.AUDIT_PERSONS_LOG (EMP_USER_MODIFIED,EMP_DATE_MODIFIED,EMP_SK,EMP_ID,EMP_NAME,EMP_RESIGNATION_DATE,EMP_STATUS_OLD,EMP_STATUS_NEW,osuser,db_user,machine)
VALUES(EMP_USER_MODIFIED,EMP_DATE_MODIFIED,EMP_SK,EMP_ID,EMP_NAME,EMP_RESIGNATION_DATE,:old.EMP_status,:new.EMP_status,osuser,db_user,machine );
COMMIT;
END;
09:59:06 AUDIT_DEV@dev>UPDATE AUDIT_DEV.AUDIT_PERSONS SET EMP_STATUS='TEST' WHERE EMP_ID='4234';
EMP_STATUS
TEST
1 row selected.
Elapsed: 00:00:00.01
10:00:03 AUDIT_DEV@dev>commit;
Commit complete.
Elapsed: 00:00:00.01
10:00:17 AUDIT_DEV@dev>select * from AUDIT_persons_log;
no rows selected
Elapsed: 00:00:00.00
10:00:17 AUDIT_DEV@dev>
Edited by: Abk on Nov 4, 2010 10:42 AM