Can't able to use :NEW in after insert trigger

When i am trying to assign value to an element of the NEW pseudo record, its giving error like :new pseudo record can't be used in this type of trigger.
What exactly i've done is given below
create or replace triger tri_name
after insert
on tab_name
for each row
begin
if :new.x='123' then
:new.y:=null;
end if;
end tri_name;
Thanks & Regards
--DKar                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

from oracle documentation...
Old and new values are available in both BEFORE and AFTER row triggers. A new column value can be assigned in a BEFORE row trigger, but not in an AFTER row trigger (because the triggering statement takes effect before an AFTER row trigger is fired). If a BEFORE row trigger changes the value of new.column, then an AFTER row trigger fired by the same statement sees the change assigned by the BEFORE row trigger.
for more details read the documentation

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