Forms :: Frm-40654 Record Has Been Updated By Another User

I am working on form 6i, database 9i.

I have a table(emp): empno, ename, job, created by, creation_date

My form :

windows: 1. main window 2. find window

Main Window: It contains data block(emp block) on table emp. Shows 'empno', 'ename', 'job', 'INSERT' button,and 'UPDATE' button.

Find Window: It contains 'empno', 'ename', 'job','created_by','creation_date', and 'FIND' button.

If i search through FIND window, it will fetch the data from 'EMP' table and shows in MAIN window, emp block.

FIND BUTTON: SELECT empno, ename, job
FROM emp
WHERE empno=:blockemp.empno
AND ename=:blockemp.ename
AND job=:blockemp.job
AND created_by=:blockemp.created_by
AND creation_date=:blockemp.creation_date

[code]....

If i query data(F11) on block emp, i can update data any number of times, it's working fine.But if i search through the FIND window, if i udpate a record, first time, it's updating; but second time if i try update the record,it's giving below error.

ERROR:frm-40654 Record has been updated by another user.Re Query to see change

I understand that it's locking the table if manually update it(when i search data through FIND window).