Autoyast - yast2-samba-client: bits and pieces

Your autoinstallation fails to join your AD domain unless you run a net join as post installation script?
You can specify  the join credentials within the samba-client section of your profile like this  ( this goes after samba's </global> )

<join>         
     <password>whatever</password>
     <user>Administrator</user> 
</join>  

Also, are you setting your <realm> and the result in your smb.conf is an empty "realm=" entry?
Try setting it twice, in both <samba-client> and <samba-server> sections, that should do the trick.