While using data pump (impdp) how to rename references within objects?

using 10g;
what i want to accomplish is to change schema & tablespace ownership using the data pump method via the command line; i have had success using the command line for expdp / impdp. Problem is that there are objects that reference the old schemas that DO NOT get updated (e.g. procedure may reference usr1.table1 in the PL/SQL statement) and this is where i have been UN-successfull). Anyone know of a way to change references from old schema to new schama name in objects(procedures, views, etc) via the command line?
this is what i currently use that works to change schema, tablespace, but will not change references within my objects;
expdp system/<pass> schemas=usr1,usr2 DIRECTORY=dp_dir DUMPFILE=dataPump_BothSchemas.dmp LOGFILE=expdpAllSchema.log parallel=2
impdp system/<pass> DIRECTORY=dp_dir DUMPFILE=dataPump_BothSchemas.dmp LOGFILE=impbothSchToEE.log remap_schema=usr1:newUsr1,usr2:newUsr2 remap_tablespace=old_ts_tables:new_ts_tables full=y
Thanks!
p.s. I have acomplished this using the enterprise manager.

(e.g. procedure may reference usr1.table1 in the PL/SQL statement) If you hard coded such reference in stored procedure, you have to manually correct them. Consider use synonym if your storage procedure referencing other schema's objects.

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While using data pump (impdp) how to rename references within objects?

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