inheritance and foreign key

I'm a postgresql newbie.

It seems that primary key is not inherited by tables.
My situtation is as follows

I've a parent table and child tables with inherit from
parent table. Parent table consists of pid (defualt
value of pid is from sequence) that is primary key.
Now all child tables inherits this attribute pid.

I've another table from where i reference this pid as:

pid integer references parent (pid)

the table creation is successful, but when i try to
insert data into this table that refereces parent
table i get error - something like the referenced
column doesn't exist.

I'm using version 7.1 in RH Linux 7.2 box.

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