How to alter the materialized view defintion with -- For update clause

My db version is 9.2.0.3
My orginal materialized view difination does not have "for update " clause.
how can i alter the mview defination to inclused and exclude the "for update" clause.
I dont want to drop and recreate the mview with for update clause. But I what to change the existing definition.
Please suggest.
Thanks
Naveen.

I already have the view definition in place. I want to change the exising defination, by adding the "for update " clause. Is it possible with any " alter mview ... " syntax.
Below is my existing syntax. I don't what to drop and recreate. Just want to alter the existing definition , with for update clause.
create materialized view test
pctfree 0
tablespace DATA storage (pctincrease 0)
build immediate refresh start with sysdate next (trunc(sysdate+1) +1/24)
with primary key
disable query rewrite
as select * from test@isource;
Please suggest!
Thanks
Naveen
Edited by: user12096071 on Apr 8, 2010 2:56 PM

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