RFC Function module Error

Dear Experts,
I have written simple Remote Function module as like given below.
Before that i did all required RFC settings in SM59 and tested from there.
It is connecting from each other.
REPORT ZTEST_RFC                               .
data: rfc_var1 type i VALUE '10',
      rfc_var2 type i VALUE '599',
      rfc_result type i.
CALL FUNCTION 'Z_SUM'
DESTINATION 'dev'
EXPORTING
    VAR1                  = RFC_VAR1
    VAR2                  = RFC_VAR2
IMPORTING
    RESULT                = RFC_RESULT
EXCEPTIONS
    COMMUNICATION_FAILURE = 1
    OTHERS                = 2.
I am getting sy-subrc eq 1.
Please guide what could be wrong...do we need pass any parameters in FM.
Thanks
Cris

Also To debug a RFC:
You need to make sure that you are able to login in to the system containing the RFC using SM59 with your own login. Now place a break point just before the RFC Fm in your se38 and press F5. now it goes into the RFC .Now you need to place a break point at your RFC FM by specifying your RFC name.
and hit F8 . It goes inside the RFC Func module code.
Try it and let me know.
Sri

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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.
I am talking about the above Receiver RFC channel which you guys are using to call R/3 from XI. That where you need to change the commit parameter

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