Can't create foreign key referencing a virtual column

create or replace table a (

  cola int(10) primary key,

  v_cola int(10) as (cola mod 10) virtual,

  p_cola int(10) as (cola mod 10) persistent

);

create index v_cola on a (v_cola);

create index p_cola on a (p_cola);

create or replace table b(

cola int(10),

v_cola int(10),

p_cola int(10)

);

alter table b add constraint `p_cola_fk`

foreign key (p_cola) references a (p_cola)

on delete restrict

on update restrict;

alter table b add constraint `v_cola_fk`

foreign key (v_cola) references a (v_cola)

on delete restrict

on update restrict;

ERROR 1005 (HY000): Can't create table `test`.`#sql-181_8` (errno: 150 "Foreign key constraint is incorrectly formed")

MariaDB [test]> show warnings;

+---------+------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

| Level   | Code | Message                                                                                                                                                                                                              |

+---------+------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

| Warning |  150 | Alter  table `test`.`b` with foreign key constraint failed. Parse error in '

foreign key (v_cola) references a (v_cola)

on delete restrict

on update restrict' near 'v_cola)

on delete restrict

on update restrict'. |

| Error   | 1005 | Can't create table `test`.`#sql-181_8` (errno: 150 "Foreign key constraint is incorrectly formed")                                                                                                                   |

| Warning | 1215 | Cannot add foreign key constraint                                                                                                                                                                                    |

+---------+------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

3 rows in set (0.00 sec)