proxy warning exception cx_ai_system_fault

Hi,

i am getting warning message: The exception CX_AI_SYSTEM_FAULT is neither caught nor is it declared in the RAISING clause of "Z_FM_PROXY_XI".

TRY.
        CALL METHOD prxy->mi_sales_order_ob_asy
          EXPORTING
            output = output1.
        COMMIT WORK.

      CATCH cx_ai_system_fault INTO fault.
        wf_errtxt = fault->get_text( ).
    ENDTRY.	

i am not sure where i am getting wrong...

can anybody provide some information on this?

Thanks

Giri