On oracle 8i
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1323002416801
On oracle 10.1
Create the types and tables dependent on those type and then use the option TABLE_EXISTS_ACTION=append on impdp
On oracle 10.2
use option TRANSFORM=oid:n on impdp
here are the metalink notes:
Note: 351519.1 - Import of Object Types Fails With ORA-39083 ORA-02304 or ORA-39117 ORA-39779
Note: 1066139.6 "IMP-17 IMP-3 ORA-2304 IMP-63 FROMUSER/TOUSER Import of Table With Object Column"
Note :1066139.6 - IMP-17 IMP-3 ORA-2304 IMP-63 FROMUSER/TOUSER Import of Table With Object Column