Forms :: Saving No Errors Shown And Neither Record Is Inserted

I have used a template to create a form which has 3 below tables / blocks in the form:

1.'OIFC_INV_DEVICE_TYPES'
2.'OIFC_INV_SECTIONS'
3.'OIFC_INV_DEVICE_MASTER'

The 1st 2 tables are used only to fetch values through a LOV and no insert happen during save and the 3rd has initial values defined and has to insert these values while click on the save (when button pressed trigger) button which has the below pasted code, but no error is thrown and neither the record is inserted,

declare
al_id alert:=FIND_ALERT('popup');
al number;
insert_val varchar2(500);
increment_value number;
MAX_VALUE NUMBER;
rec_check varchar2(1);
[code]....