PL/SQL :: Assign Partitioned Index To Primary Key

create table mypart(a number, b number, c number, p_key number) PARTITION BY RANGE (p_key)
( PARTITION p0 VALUES LESS THAN (18),
PARTITION p1 VALUES LESS THAN (29),
PARTITION p3 VALUES LESS THAN (MAXVALUE)
)  ENABLE ROW MOVEMENT;

create index idx_mypart on mypart(p_key,a,b)

I want to create primary key on this table that will use the local partitioned index idx_mypart

can I do that ?

alter table mypart add constraint pk_mypart primary key using index (idx_mypart)

above syntax gives error

basically the primary key should make use of the local partitioned index.