Content Profile and User Services

Hello. I am trying to create a new user with User Services and a Flash client (as3). The server is AMFPHP.

The thing is that I have required CCK fields associated with the user thru the Content Profile module.
If these fields are not required I can create the user with no problems with the following code:

var myResponder2:Responder = new Responder(getNodeInfo, onFault);
myService.call('user.save', myResponder2, {name: 'teste2', pass: 'teste2', mail: 'alexandre2@eeedf.com'});

This code works if CCK field is not required but returns an error when I set it to required, stating that the field is missing. This is normal behavior.
My question is how do I set the data for the CCK fields?

I tried (actionscript 3):

var myResponder2:Responder = new Responder(getNodeInfo, onFault);
myService.call('user.save', myResponder2, {name: 'teste2', pass: 'teste2', mail: 'alexandre2@eeedf.com', field_teste: 'teste'});

(Being "field_teste" the name of the CCK field)

and it does not return an error (meaning it's partially what the method was expecting... because if i give an invalid name to "field_teste" I get the same error as before saying the field is missing) but the user doesn't get created either.

I found that the execution of the code breaks in this line but does not return an error (and doen't create a user either):
line 173: $ret = drupal_execute('user_register', $form_state);

(in modules/services/services/user_service/user_service.inc)

Now what i would like to know is what's executed after this call: drupal_execute('user_register', $form_state);

So that I can trace what's going on after this....

Can anyone help me?

Thanks

Alexandre