RFC function module without RETURN parameter thows error in XI. Please help

Hi Experts,
I have a File to RFC scenario in XI. The RFC function module that I am using at the receiving end does not have "RETURN" parameter. So when I test my scenario I get "RETURN" parameter not found error on SXMB_MONI.
So is it mandatory that RFC function module must have RETURN parameter when used in XI?
Is there any work around to avoid the error without changing the RFC function module?
Please help!
Thanks
Gopal

In my senario the QOS is best effort because it is a Sync.
But the function module is sync in nature as it is returning a parameter called SO_Docs and Ret_Msg. The Ret_Msg contains the error info but it not of BAPIRET2 type.
So is there any way to avoid this error when my QOS is best effort?
Please help!
Gopal

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read the original message
We are trying to call RFC function module CBIF_GLM1_PROCESS_ORDER_READ (This is not a BAPI and also not released ) in R/3 from XI system.
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RFC function module without RETURN parameter thows error in XI. Please help

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