Heterogeneous system copy from MSSQL to Oracle

Question

Dear Experts,
I have performed ABAP+JAVA system copy R3load based from Oracle to Oracle and MSSQL to MSSQL platform.
Homogeneous system copy many times.
But this is first time i am perfoming an Export from MSSQL source system with r3load Export method .....My Target system is havign Oracle 10.2.0.2 software installed along with installation prerequisites.
But while Importing the same MSSQL Export ...I am not getting any option for heterogeneous system copy.
I am running on ECC6.0 windows platform and i also have generated Migartion KEY.
But where should i put this key.
I have gone through system copy guide many times but unable to understand Exact options to follow to Migrate to Oracle target system. Appreciate if anyone can give me detail steps i need to carry on Target system
Best Regards,
AjitR

Answer 1

Markus,
Thanks for the help, i have done Export with mentioned way and this time DBSIZE.xml file got created under ORA directory ....i started installation at target system....It went smooth until phase Import java Dump Done. .....But during Post load activities It gave error...
When i tried connectivity to Oracle database it works fine and
R3trans -d gives below mentioned error....Looks like table does not exist....all ENV variables are also got set at target machine.....
Error as below
Now 'SAPSR3/<pwd>@TST' is connected (con_hdl 0, nls_hdl 0).
4 ETW000                                                                             389  0.171885
4 ETW000  [dev trc     ,00000]  Database NLS settings: AMERICAN_AMERICA.UTF8       23682  0.195567
4 ETW000  [dev trc     ,00000]  Database instance TST is running on CSSLDELL-3 with ORACLE version 10.2.0.2.0 since 20080522
4 ETW000                                                                            4056  0.199623
4 ETW000  [dev trc     ,00000]  Connection 0 opened (DBSL handle 0)                14523  0.214146
4 ETW000  [dblink      ,01299]  ***LOG BZA=>table SVERS      does not exist on database            [dblink#3 @ 1299]
4 ETW000                                                                            8145  0.222291
4 ETW000  [dev trc     ,00000]  NTAB: SELECT COMPCNT FROM DDNTT FAILED              1021  0.223312
4 ETW000  [dev trc     ,00000]  NTAB: SELECT VERSION FROM DDNTT FAILED               520  0.223832
4 ETW000  [dbntab.c    ,00000]  *** ERROR => NTAB: SELECT VERSION/DBASE FROM DDNTT FAILED
4 ETW000                                                                             505  0.224337
4 ETW000  [dbntab      ,01273]  ***LOG BZY=>unexpected return code 103        calling NTAB       [dbntab#3 @ 12737]
Please help...Points rewarded anyways.....