avoiding ORA-31684, ORA-39083 and ORA-01919
Import: Release 11.2.0.4.0 - Production on Thu Oct 22 18:39:45 2015
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Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "SYSTEM"."SYS_IMPORT_SCHEMA_02" successfully loaded/unloaded
Starting "SYSTEM"."SYS_IMPORT_SCHEMA_02": system/******** schemas=someuser dumpfile=ORAPRD01_DPEXP_SOMEUSER_01.DMP logfile=ORAPRD.log directory=DATA_PUMP_DIR exclude=grant
Processing object type SCHEMA_EXPORT/USER
ORA-31684: Object type USER:"SOMEUSER" already exists
Processing object type SCHEMA_EXPORT/ROLE_GRANT
ORA-39083: Object type ROLE_GRANT failed to create with error: