ORA-14400: inserted partition key does not map to any partition

create table tq84_part_intv_rng (
    num    number,
    grp    varchar2(1),
    val    number
)
partition by range (num) interval (100)
    subpartition by list (grp)
        subpartition template (
          subpartition sub_part_a values ('A'),
          subpartition sub_part_b values ('B'),
          subpartition sub_part_c values ('C')
        )
(
  partition values less than ( 100 ) 
);

insert into tq84_part_intv_rng values (444, 'X', 42);