Insert statement in when-checkbox-checked trigger doesn't work

Question

in a when-checkbox-checked trigger, I wrote the follwing code :
IF :sunday = 'Y' THEN
msg_alert('Y','I',false);
pkg_var.v_day_count := pkg_var.v_day_count + 1;
msg_alert('1','I',false);
:schtm_skmk.day_id := '1';
msg_alert('2 ',I',false);
INSERT INTO schtm      
(ROUTE_ID, DAY_ID, FLIGHT_ID)
VALUES
(:schmf.ROUTE_ID, :schtm_skmk.day_id, 1);
COMMIT;
msg_alert('end insert schtm','I',false);
END IF;     
if the checkbox is checked, I assigned value '1' to day_id. Then, I want to insert a row into table SCHTM. But, the insert statement fail. The msg_alert '2' pop up. The msg_alert 'end insert schtm' does not pop up, meaning the insert statement fail. It also fail after I replace the insert statement with the exact value of the item. But if I execute this statement in SQL plus, it insert a row into the database.
What is strange here is it did work before, I successfully insert 2 rows into database. But when I test it again just a while later, it never work anymore.
Please help.
Thanks,
Shu Wen

Answer 1

It seems that you have missed ELSE. By the way there is only one INSERT ...