RfcSendData 
To send the result parameters back to the caller, use this function:
RFC_RC SAP_API RfcSendData(RFC_HANDLE handle, RFC_PARAMETER * parameters, RFC_TABLE * tables);
The tables description (RFC_TABLE) must be the same as in the previous RfcGetData call.
This function is defined in SAPRFC.H.
RFC_OK
RFC_FAILURE
Function parameters:
handle
Rfc connection handle
parameters
'exporting' parameters
tables
'tables' parameters (must be in the same structure as passed to RfcGetData)
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RfcRaise should be used instead of RfcSendData if an exception is to be raised. If RfcRaise is used, then do not send off an additional RfcSendData.