samba - Feb 2008 - problem with init_iconv on Debian 4.0 Amd64

Hi, 
I' ve found a lot of issues of the same probllem on the web , but no
solution. So if someone can help me? 
 
I have a Debian Server with linux-image-2.6.18-5-amd64 and  Samba 3.0.24-6et
 
    in my smb.conf I put these lines: 
   
[global]
            unix charset = UTF8
            display charset = IS0-8859-15
...
 
But when I run testparm I get the error: 
 
    Load smb config files from /etc/samba/smb.conf
init_iconv: Conversion from UTF-16LE to IS0-8859-15 not supported
init_iconv: Attempting to replace with conversion from UTF-16LE to ASCII
init_iconv: Conversion from UTF8 to IS0-8859-15 not supported
init_iconv: Attempting to replace with conversion from ASCII to ASCII
init_iconv: Conversion from IS0-8859-15 to UTF-16LE not supported
init_iconv: Attempting to replace with conversion from ASCII to UTF-16LE
init_iconv: Conversion from IS0-8859-15 to UTF8 not supported
init_iconv: Attempting to replace with conversion from ASCII to ASCII
init_iconv: Conversion from IS0-8859-15 to CP850 not supported
init_iconv: Attempting to replace with conversion from ASCII to ASCII
init_iconv: Conversion from IS0-8859-15 to UTF8 not supported
init_iconv: Attempting to replace with conversion from ASCII to ASCII
init_iconv: Conversion from CP850 to IS0-8859-15 not supported
init_iconv: Attempting to replace with conversion from ASCII to ASCII
init_iconv: Conversion from UTF8 to IS0-8859-15 not supported
init_iconv: Attempting to replace with conversion from ASCII to ASCII
...
 
On another Debian test server,  with linux-image-2.6.18-6-686 and the same
Samba environnement It works well !! 
  
Is there a bug on the 64 bits linux version and Samba ? 
 
Someone can help me?