inheritance and FK

I am trying to create two tables: parent and child. Child inherits from
the parent and has a foregn key (FK) referencing parent's primary key
(PK). Suppose parent table has one row with PK = 1 and I have one row in
the child table with FK=1 and PK=2. Now, I want to insert another row in
the child table with FK = 2, however it won't let me do this, since
parent table does not have a record with PK = 2.
I was expecting that children tables will also be searched when
verifying a foreign key constraint referencing the parent table.
Is there a way to force this kind of "hierarchical" foreign key
constraint check?

Thanks.

Oleg

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