Error Details:
==============
ORA-31693: Table data object “COMMON”.”LOC_ITEM_DSPTCH_SPEC” failed to load/unload and is being skipped due to error:
ORA-31640: unable to open dump file “/dev/shm/Q1051842/OMS_O_CUST_COMMON.dmp” for read
ORA-19505: failed to identify file “/dev/shm/Q1051842/OMS_O_CUST_COMMON.dmp”
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory

Solution Description:
=====================
Issue is due to the mount/file system was not being accessible from the second node in the RAC.
Then I made Cluster=N to force Data Pump to use only the instance where the job is started and ran again data pump job using below parfile

userid=”/ as sysdba”
CLUSTER=N
directory=MYDIR
JOB_NAME=JOB24_10thFeb2015
dumpfile=OMS_O_CUST_COMMON.dmp
logfile=imp_OMS_O_CUST_COMMON_10thFeb.log
TABLE_EXISTS_ACTION=REPLACE
EXCLUDE=db_link
schemas=OMS_O,CUST,COMMON