reference to a view

In my db I have a table type_of_action, fields code varchar, name
varchar, medical boolean. Two other tables refer to this table, one of
them to the medical rows, the other one to the none-medical rows. I
would like to make the reference with a view, like this:

create table type of action_type (
  code varchar,
  name varchar,
  medical boolean
);

create view action_type_medical as select * from action_type
  where medical=true;
create view action_type_non_medical as select * from action_type
  where medical=false;

create table general_actions (
  field1, field2, field_etc,
  action_type varchar references action_type_non_medical(code)
);

create table medical_actions (
  field1, field2, field_etc,
  action_type varchar references action_type_medical(code)
);

But pg refuses this, can't create a reference to a view. I can now
create a trigger plus function that will do the check, but is there a
more elegant way? Thanks!

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10:35-10:41
Fedora Core release 2 (Tettnang) Linux 2.6.6-1.435