Hi Krishi,
The Transaction code which u have given is not valid. In order to Upload data to kna1 table which is Customer Master Table u need to give tcode as 'XD01'.
Syntax for call transaction:-
http://help.sap.com/saphelp_erp60_sp/helpdata/en/fa/09715a543b11d1898e0000e8322d00/content.htm
call transaction 'XD01' using it_bdcdata mode 'A'.
Regards,
Vineesh.