Synchronous RFC functions from XI

Please confirm my observations.

I wanted to call a synchronously RFC Function i.e. Importing some data and Exporting some reply.

The XI message monitor shows that the RFC adapter handles this call asynchronously i.e. QOS of EO and not BE as I would have expected.

Is this behaviour I observe correct and does this then imply that there is no way of calling RFC enabled Functions on SAP expecting anything back

Thanks

Andre