Hi All, I need your expertise to solve my problem, my account has permission to make sudo and su but when I try to switch user in a shell, it does not work with following message:
"Sorry, user jmbeltra is not allowed to execute '/usr/bin/su -c echo HELLO THERE - oracle' as root on dbbr1k01"
I logged on with my personal account (jmbeltra) and try to switch to oracle account into a shell.
Could you assist me about ??

It means what it says. Sudo is not configured to let you do that. Ask your administrator to configure it for you.

try this as a command note the double quotes

sudo su - oracle -c "echo 'hi there' "

Thanks for your prompt answers, so I've tried with different similar syntaxis ways as
sudo su - oracle -c "command"
sudo su - oracle "-c command"
sudo su - oracle -c 'command';

and result the same
Also an SA checked out configuration and it looks fine, in fact I can do this in commnad line properly good, the point is into a shell is when it doesn't work

There's nothing wrong with it per-se. They simply haven't configured sudo to allow you to do it. sudo can be used in a variety of ways, and they don't have to let you use it that way if they don't actually want to.

Ask your administrator to do so.