[Samba] file permissions change to readonly

[Ashish Tyagi]

Hi 

I have installed samba-3.0.11-5.of.2 on RHEL-3.windows 2003 is being
used for authentication (security=ADS). i have a share 'test' and have
given rwx permission to parent group and one other group.SGID bit is set
on this share. when someone from either group create a Microsoft Excel
file in this share it is writable but after someone else write to this
file, read only bit gets set on this file and no one can write to this
file.it shows Sharing violation error. it does not happens on normal
text files.
please provide some hint.

Regards
Ashish