CSLA and WCF

Hi everyone,

I don't have any experience in csla, a bit surfed forums, saw some similar questions and probably know the answer, but still would like to clarify with more experienced person:

Is it bad practice to use CSLA business object as WCF service input/output or is this even possible? I mean either return object or input parameter. Is this a bad practice? Should  DTO be used instead?

Also other one more philosophic one: Is it a good practice that wcf will call csla object or csla object itself should call wcf?

Thanks,

--O