forms troubles

[eto_toe_dba]

hi,
I've next problem:
In a compilled form module when i press the button (which it should to return to me the result of my interogation) i'm obtaining next error message:
frm-40735ra-04122:exact fetch returns more then requested number of rows.
How do i treat this error in my internal code?
the data stored in the interogation table excludes any duplicates.
Thanks a lot!
sorry for my english!

[ahmadbilal]

U can use Following Code In Form level (ON-Error)Trigger

BEGIN
/*Put Error Message umber here*/
IF ERROR_CODE = '40815' THEN
NULL;
ELSE
MESSAGE (ERROR_CODE || ' ' || ERROR_TEXT);
MESSAGE (' ');
CLEAR_MESSAGE;
END IF;

END;