[Samba] smbpasswd overwrites existing displayname in LDAP entry

[Ruud Baart]

Configuration: Samba 2.2.8a with openLDAP 2.1.30 on a SeSE 8.2. server

When adding a user using a ldif file we give the user a given name, say Ruud Baart. 
The cn and uid are the same, say 21cs12345 (a studentnumber).

After adding the user to LDAP the displayname is as expected: "Ruud Baart". 
However after smbpasswd -a 21cs12345 -s secret the displayname is "21cs12345".

That is, of course, not what we want. Is there any solution for this problem?

Met vriendelijke groet/Regards,
Prompt
R.J. Baart

Kerkstraat 173
5261 CW Vught
Netherlands
Http://WWW.Prompt.NL
Tel.: +31 73 6567041                          
Fax.: +31 73 6573513