samba - May 2003 - Join the Domain and the"Nomapping ...error"

Hi all! 

I almost had my samba+ldap+PDC working.
Everything is working fine (e.g. \\PDC-SRV\anyuser works fine), but, because 
there?s always a but, when i try to join wi2k wks to the domain and it gives 
the "No mapping between the account and security ids has done".
I followed carefully the IDEALX and the Ignacio Coupeau Howto's, and 
extensively searched stuff in google and nothing ... 

Any pointers would be grealy appreciated ... 

Thanks for your time 

Jose Luis