samba - Jul 2014 - W7 and Roaming Profiles on two different PDC

Hello,

I use a Samba 3.6.12-59.23.1-3256-SUSE-SL12.3-x86_64 coming with 
openSUSE 12.3 as a PDC. I also use roaming profiles with Windows 7 Pro 
clients. This works perfect.
Now I need to _move some clients_ / profiles to another server with 
Samba 4.1.9-3.22.1-3256-SUSE-oS13.1-i386 (openSUSE 13.1). This one works 
already fine, but with different users. So I can exlude mistakes in my 
configuration. I also use the same one as with the old PDC - only the 
domain name is different.
First I tried to copy the directories /etc/samba, /var/lib/samba and the 
files /etc/group, /etc/passwd and /etc/shadow to the new server and set 
the sid with net setlocalsid.

Then I've tried to export and import the user data and get the following 
error message(s):

bdc-server:~/.Skripte # pdbedit -e smbpasswd:/root/samba-users.backup
Importing account for FI-06$...ok
Importing account for FI-04$...ok
Importing account for FI-02$...ok
build_sam_pass: Failing attempt to store user with non-uid based user RID.
Importing account for advoplex...failed
Importing account for admin...ok
Importing account for chrissi...ok
build_sam_pass: Failing attempt to store user with non-uid based user RID.
Importing account for alex...failed

What does that mean and how can I repair it?

If you need further information, let me know. All users had been added 
at the same time with a bash script. So I can't explain, why some users 
are exported without error and other not.

Thanks for helping, Alex