Functions returning complex types.

I'm trying to use a function that returns a complex type. I have no problem
creating the function but when I try to use it I get the message:

ERROR:  function in FROM has unsupported return type

Apparently, this message stems from the parser. Changing the function so
that it returns a SETOF the same complex type works fine.

Is this the expected behavior? Is SETOF a requirement when using complex
types?

Regards,

- thomas