[Samba] users db problem

[Marco Marinelli tiscali]

Hi, i never post in this list before becouse all the developers did a
great job before, but
now i have a problem.
I used samba 3.0.x for a long time without any problem with openldap as
passwd backend, now with samba 3.0.12
there are stange message when i try to change account's passwd:

# smbpasswd Administrator
New SMB password:
Retype new SMB password:
account_policy_get: tdb_fetch_uint32 failed for field 4 (maximum
password age (seconds since 1970)), returning 0
account_policy_get: tdb_fetch_uint32 failed for field 5 (minimum
password age (seconds since 1970)), returning 0

same thing when i try to modify the account's policy:

# pdbedit -P 'maximum password age (seconds since 1970)' -C 0
account_policy_get: tdb_fetch_uint32 failed for field 4 (maximum
password age (seconds since 1970)), returning 0
valid account policy, but unable to fetch value!

I'm using slackware current with kernel 2.6.9, openldap 2.2.20 and
nss_ldap, there are some changes that i must do for samba 3.0.12?

Thanks!