The index cannot be created as the table has duplicate keys - Patch 16000686

Dear Colleagues,

after upgrade from R12.0.6 to R12.1.1 i have to apply patch 16000686

this path stuck with an error "CREATE UNIQUE INDEX HR.HR_DOCUMENT_TYPES_U1 ON HR.HR_DOCUMENT_TYPES
 (SYSTEM_DOCUMENT_TYPE) LOGGING STORAGE (FREELIST GROUPS 4 FREELISTS 4 )
 PCTFREE 0 INITRANS 11 MAXTRANS 255 COMPUTE STATISTICS  TABLESPACE
 APPS_TS_TX_IDX

Statement executed.

AD Worker error:
The index cannot be created as the table has duplicate keys."

i found one note id :1446163.1 but i don't understand which document_type_id should i delete ?

see attched worker.log file

Any help?

Regards

Chaker