moria, you did not post your impdp command. By any chance are you trying to remap the tablespaces? The tablespace name for a domain index is part of the storage reference and cannot be remapped by impdp. You have to extract the index DDL and build it manually after editing.
If you are not remapping then opening a ticket with support may well be your best bet, but someone might spot something if you post the full impdp command in use.
HTH -- Mark D Powell --