Problems with META Directory

Hello! I'm dealing with META directory for the users of my portal
(customized CPS 3.4.2) that takes the fields from two backing
directories:

* SQL directory schema (Moodle - mySQL DB):
    - username (identification field)
    - password  
    - firstname
    - lastname
    - email
    - address
    - city

* ZODB directory schema (fields of the "old" CPS schema 'members'):
    - confirm
    - email
    - fullname
    - givenNme
    - groups
    - homeless
    - id (identification field)
    - password
    - roles
    - sn
    - login_time (custom)
    - access_from (custom)
    - access_to (custom)
    - last_login_time (custom)
    - join_time (custom)
    - sn2 (custom)

My META directory is called 'members' to use it as the default directory
for every users in the portal, so the META has this schema:
- confirm
    - email
    - fullname
    - givenNme
    - groups
    - homeless
    - id (identification field)
    - password
    - roles
    - sn
    - login_time (custom)
    - access_from (custom)
    - access_to (custom)
    - last_login_time (custom)
    - join_time (custom)    
    - sn2 (custom)
    - address (SQL dir)
    - city (SQL dir)
    - id_sql (SQL dir id compatibility, refers to 'id' field when
writing)
    - id_zodb (ZODB dir id compatibility, refers to 'id' field when
writing)


In the Backings feature of the META directory:

* SQL backing
    - Fields renaming : In sql_dir      In members (meta)
                        username        id_sql  
                        firstname       givenName
                        lastname        sn
    - Ignore fields : 
    - Expresion for entry fields :

* ZODB backing
    - Fields renaming : In sql_dir      In members (meta)
                        id              id_zodb  
                        
    - Ignore fields : email givenName sn password fullname (I want to
use these fields from the SQL dir)
    - Expresion for entry fields : python:{'id' : '', 'roles' :
['Member'], 'groups' : [], 'homeless' : 0, 'sn2' : '', 'login_time' :
'2000/01/01' , 'last_login_time' : None , 'join_time' : None,
'access_from' : None, 'access_to' : None, 'confirm':''} (compatibility
with schema's fields default values)

Ok, once this has been done, the portal can read the fields from Moodle,
and it composes the entry with the zodb fields (OK). I can search, edit,
create and delete entries from the portal (META) and its associated
entries (SQL, ZODB). 

Everything seems to work fine until  I want to LOG IN the portal with
one of the users from Moodle, the Authentication fails, and looing at
the logs it looks like a KeyError exception.


Anybody can help me with this? 
Is it a bad configuration of the directories (META, backings,
schemas...)?
Anything?

Thanks a lot!
    
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