SQL & PL/SQL

Hello,

I have to update a table called status where the status to change is for example 300 and I want to change to 50, the next query is not working, the message that I receive is:

ORA-01732: data manipulation operation not legal on this view,

And this is the query:

update (SELECT a.* FROM (SELECT codcocina,status,fecmodif FROM vd.vdpedido ORDER BY FECMODIF DESC) a WHERE rownum = 1) set STATUS = 300

So Im telling to sql that the first row that contain the codcocina, status(whatever the value is) order by date (fecmodif) set the status = 300 to the first value (definied by rownum = 1).

Any help?????, Sorry for my english.