Forms :: 6i - One Data Block Based On Table / Fetching Data

I am working on forms 6i. I have one data block based on table EMP.

Datablock-A: Empno, Ename, Sal

I have FIND Screen: Empno, Ename, FIND Button.

I can search the data through FIND Screen and populate data in Datablock A.

I am using below logic to search data through FIND Screen.

When-Button-Pressed(FIND Button): calling 'EXECUTE_QUERY'.

In Pre-query trigger of DatablockA:

copy(:FIND.EMPNO,'BLOCKA.EMPNO');
copy(:FIND.ENAME,'BLOCKA.ENAME');

It's working fine. But below case is failing.

Let us say, if i enter empno 10 (which is not there in database) in FIND Screen --> press FIND Button, it's showing up 'QUERY CAUSED NO RECORDS', Till this point it's working fine;. But after this, if i press CTR+F11 in block A, it's not pulling records. only this case it's not pulling records.

But if i enter something else in FIND Screen, if it returns any data, then if i press CTR+F11,it's pulling all records.

why it's failing to pull records if i try to query data in first case only.