Hi Gowrinath,
Kindly note that this is not an issue. With each release SAP makes some changes to the system. In earlier releases (eg., 3.0/3.1) these two fields were not there. But from ECC 4.X onwards these two new fields were added. I suppose the version of Netweaver that you are currently using is 7.31 and so the version of ECC might be 6.0. Since this is a newer version you should always choose the option 'IDoc record types SAP release 4.x'.
Regards,
Rahul Muraleedharan.