My SLES is 10 SP4.
The quota version is quota-3.13-17.11.
I want to set test group using the / db partition quota soft limit of 10K, hard limit 20K.
In the test group following a two users, test1 and test2.
My configuration is as follows:

test1@linux-apple:~> cat /etc/group | grep test
test:!:1000:test1,test2

test1@linux-apple:~> cat /etc/passwd | grep test*
test1:x:1001:100::/home/test1:/bin/bash
test2:x:1002:100::/home/test2:/bin/bash

test2@linux-apple:~> cat /etc/fstab | grep grpquota
/dev/sda10 /db ext3 acl,user_xattr,grpquota 1 2

inux-apple:~ # ll /db
total 44
-rw------- 1 root root 7168 Aug 17 12:07 aquota.group

isk quotas for group test (gid 1000):
Filesystem blocks soft hard inodes soft hard
/dev/sda10 0 10 20 0 0 0

quotaon -gv /db

linux-apple:~ # su - test1
test1@linux-apple:~> dd if=/dev/zero of=/db/test1test1 bs=1k count=30
30+0 records in
30+0 records out
30720 bytes (31 kB) copied, 0.00022 seconds, 140 MB/s
test1@linux-apple:~> ls -lh /db | grep test1test1
-rw-r--r-- 1 test1 users 30K 2013-08-17 12:23 test1test1