public static extern RfcRc RfcGetParameterDescByIndex(IntPtr funcDesc, uint index, out RFC_PARAMETER_DESC paramDesc, out RfcErrorInfo errorInfo);
public static extern RfcRc RfcGetParameterDescByName(IntPtr funcDesc, string name, out RFC_PARAMETER_DESC paramDesc, out RfcErrorInfo errorInfo);
public static extern RfcRc RfcAddParameter(IntPtr funcDesc, ref RFC_PARAMETER_DESC paramDescr, out RfcErrorInfo errorInfo);