crontab: you are not authorized to use cron. Sorry.

On my HP-UX database server, I tried to open crontab and got the below error

$ crontab -l
crontab: you are not authorized to use cron.  Sorry.
$ crontab -e
crontab: you are not authorized to use cron.  Sorry.

Tried searching the error and found the solution , its a simple solution

Add "oracle" username is the below file and you are all set.

/usr/lib/cron/cron.allow

No service , or machine reboot is required for this.