samba - Sep 2012 - Is it possible to add user to samba without a system account?

hi, all

    I tested this in CentOS 6.4, with

samba-common-3.5.10-114.el6.x86_64
samba-winbind-clients-3.5.10-114.el6.x86_64
samba-3.5.10-114.el6.x86_64
samba-swat-3.5.10-114.el6.x86_64

   If foxban have a system account, invoking smbpasswd -a foxban works good.

   However, if foxban2 is not a system account, smbpasswd -a foxban2 gives
me the follows:

# smbpasswd -a foxban2
New SMB password:
Retype new SMB password:
Failed to add entry for user foxban2.

   Is it intended to?

   thanks

Wang Li

Regards.