uupick and uucp

Hi,
Files are being transfered using uucp command in the directory
/usr/spool/uucppublic/receive/wes/cboas7/CB/abc.txt
/usr/spool/uucppublic/receive/wes/nrserv3/NR/abc.txt

When I was using solaris 2.6, I was not getting any error while changing the file ownership or file permission. Now I have upgraded the OS from soalris 2.6 to solaris 2.9. But now I am getting the below error while changing the file permission or file owner ship.
chgrp: /usr/spool/uucppublic/receive/wes/nrserv3/wesso3581: Not owner
chgrp: /usr/spool/uucppublic/receive/wes/nrserv3/wesso3582: Not owner
chgrp: /usr/spool/uucppublic/receive/wes/nrserv3/wesso3583: Not owner
chmod: WARNING: can't change /usr/spool/uucppublic/receive/wes/nrserv3/wesso3581
chmod: WARNING: can't change /usr/spool/uucppublic/receive/wes/nrserv3/wesso3582
chmod: WARNING: can't change /usr/spool/uucppublic/receive/wes/nrserv3/wesso3583

Please help me how to resolve this issue.

Thanks