create table SOME$TABLE (SOME$FIELD  integer);
create view SOME$VIEW1(SOME$FIELD) as select T.SOME$FIELD from SOME$TABLE T;
create view SOME$VIEW2(SOME$FIELD) as select T.SOME$FIELD from SOME$VIEW1 T;

create domain D$SOME$DOMAIN as integer;
alter table SOME$TABLE alter column SOME$FIELD type D$SOME$DOMAIN;

This operation is not defined for system tables.
unsuccessful metadata update.
cannot delete.
DOMAIN RDB$XXXXX.
there are 1 dependencies.