Can't change smb password via smbpasswd

[Michael Glauche]

Hi,
  I got a strange problem testing out 2.1.0-prealpha cvs from yesturday.
When I do "smbpasswd <user>" it tells :
Failed to find entry for user <user>.
Failed to change password entry for <user>

my /etc/smbpasswd looks like : 

mg:1009:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[U     
]:LCT-00000000::
li:1024:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:[U         
]:LCT-00000000::

Now I try smbpasswd -D 9999 li  :
smbpasswd -D 9999 li
New SMB password:
Retype new SMB password:
search by name: li
startfilepwent: opening file /etc/smbpasswd
getsmbfilepwent: returning passwd entry for unix user mg, unix uid 1009
unixuser:mg uid:1009 acb:10
pwdb_smb_map_names
lookupsmbpwnam: unix user name mg
lookupsmbpwuid: unix uid 1009
initialising map 
lookupsmbpwuid: unix uid 1009
endfilepwent: closed file.
pwdb_smb_map_names
Failed to find entry for user li.
Failed to change password entry for li

So it only finds user mg ?! What does "abc:10" mean ?

TIA,
   Michael