importing (impdp) 10gR1 dumpfile into an 11.1.0.6.0 database fails with ORA-39126: Worker unexpected

 HI,
I am trying to do an impdp of a dumpfile (full db export) of a 10g R1 (10.1.0.4.0) database into an 11gR1 (11.1.0.6.0) database. However the operation fails with the following errors:

============================================================
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.PUT_DDL [FUNCTION:"PARS"."CDWP_CHK_FUN_IS_BUSINESS_RULE"]
ORA-44001: invalid schema

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPW$WORKER", line 7709

----- PL/SQL Call Stack -----
  object      line  object
  handle    number  name
0xae289a80     18051  package body SYS.KUPW$WORKER
0xae289a80      7736  package body SYS.KUPW$WORKER
0xae289a80     15665  package body SYS.KUPW$WORKER
0xae289a80     15081  package body SYS.KUPW$WORKER