HP-UX crontab: you are not authorized to use cron

Login as root
Edit the /usr/lib/cron/cron.allow file
Add “oracle” at the end.
Logout and login as “oracle” user again.

source[http://linux.wxs.ro/2010/06/03/hp-ux-crontab-you-are-not-authorized-to-use-cron/]