Deleting a Scheduled Request

There is no standard functionality to delete any saved schedule.
The saved schedules are being stored in the table fnd_conc_release_classes_vl

SELECT
,release_class_id
,application_id
,release_class_name schedule_name
,description
,class_type schedule_type
FROM
fnd_conc_release_classes_vl
WHERE
owner_req_id is null and
enabled_flag != ‘N’ and
nvl(start_date_active,sysdate) <= sysdate and nvl(end_date_active, sysdate) >= sysdate
order by release_class_name

If you want to delete any saved schedule then you can perform any of the following:
Delete the row from the table FND_CONC_RELEASE_CLASSES_VL for the saved schedule.
OR
It will be better to update the ENABLED_FLAG = ‘N’ for the saved schedule instead of deleting the row
from the table FND_CONC_RELEASE_CLASSES_VL.