[Samba] cannot write xls file after saving

[Nerijus Baliunas]

Hello,

I am using 3.0.15pre2. Share definitions:
[Grupes]
    path = /home/Grupes
    writeable = yes
    admin users = DOMAIN+administrator
    valid users = @"DOMAIN+domain users"
    store dos attributes = yes
    map hidden = no
    map system = no
    map archive = no
    dos filemode = yes

File ACLs before opening:
# file: Pazymejimai-forma2.xls
# owner: root
# group: DOMAIN+domain\040users
user::rwx
group::---
group:DOMAIN+personalas:rwx
mask::rwx
other::---

I am user test2, which belongs to group DOMAIN+personalas.
When I open file and save it, I get the following message in Excel:

The document was saved successfully, but Excel cannot re-open it because
of a sharing violation. Please close the document and try to open it again.

ACLs now:
# file: Pazymejimai-forma2.xls
# owner: DOMAIN+test2
# group: DOMAIN+domain\040users
user::r--
user:root:rwx
group::---
group:DOMAIN+personalas:rwx
mask::rwx
other::---

I tried to add to share definition
create mask = 660
force create mode = 660
but it didn't help.

ACLs of a parent dir:
# file: Administravimas
# owner: root
# group: DOMAIN+domain\040users
user::rwx
user:DOMAIN+sigitak:rwx
group::---
group:DOMAIN+personalas:rwx
mask::rwx
other::---
default:user::rwx
default:user:DOMAIN+sigitak:rwx
default:group::---
default:group:DOMAIN+personalas:rwx
default:mask::rwx
default:other::---

Any ideas? Because now after each save of a first time opened file
I have to change user permissions to rw.

Regards,
Nerijus