Why cannot delete from a table with reference to another

Question

I have looked for answers but maybe I miss something. I have 2 tables see below. The entities from the first table is referenced from the second one, but when I try to delete fr

Answer 1

The documentation says:

Usually, the parent key of a foreign key constraint is the primary key of the parent table. If they are not the primary key, then the parent key columns must be collectively subject to a UNIQUE constraint or have a UNIQUE index.

This requirement is not met for the reference to role(name).