-bash: ulimit: open files: cannot modify limit: Operation not permitted

Hi all,
i´m preparing a linux 64bits environment to install Oracle 10g R2. I´m following the installation manual and there say that:
Depending on the oracle user's default shell, make the following changes to the default shell startup file:
For the Bourne, Bash, or Korn shell, add the following lines in the /etc/profile file (or the /etc/profile.local file on SUSE systems):
if [ $USER = "oracle" ]; then
if [ $SHELL = "/bin/ksh" ]; then
ulimit -p 16384
ulimit -n 65536
else
ulimit -u 16384 -n 65536
fi
fi
Ok, I did it, so when execute the follow comand I get a error like this.
tetis:/etc # su - oracle
-bash: ulimit: open files: cannot modify limit: Operation not permitted
oracle@tetis:~>
Can anybody help me ?
Regards,
Wander (Brazil)

The limits for -u and -n are defined in limits.conf, it looks like the -n section is not working (-u is already 16384), just to double check, show us the output for:
$ more /etc/security/limits.conf | grep oracle
oracle              soft    nproc   2047
oracle              hard    nproc   16384
oracle              soft    nofile 1024
oracle              hard    nofile 65536
$ more /etc/pam.d/login | grep pam_limits
session    required     pam_limits.soEnrique

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[email protected]'s password:
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data seg size           (kbytes, -d) unlimited
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file size               (blocks, -f) unlimited
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stack size              (kbytes, -s) unlimited
cpu time               (seconds, -t) unlimited
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data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
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Hi!
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$
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4096
$
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4096
$ ulimit -n 63536
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63536
$
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EOF
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