ORA-14451: unsupported feature with temporary table

create private temporary table ora$ptt_x (
   id  integer not null,
   txt varchar2(10)
);

create private temporary table ora$ptt_x (
   id  integer unique,
   txt varchar2(10)
);

create private temporary table ora$ptt_x (
   id  integer primary key,
   txt varchar2(10)
);

create private temporary table ora$ptt_x (
   id  integer,
   txt varchar2(10)
);