[Samba] Unable to modify passwd TDB!

[sapierzynski at poczta.onet.pl]

Hello,
Could you help me with samba 3.0.14-Debian and 3.0.21?
I have been searching the info. according to migration data between smbpasswd and tdbsam.
There are mistakes during process of migration.
"Unable to modify passwd TDB! Error: Record exists occured while storing the main record (USER_sdxhqt091$)"
What dose it stand for? 

Best regards,
grzegorz