is_a on a primark key?

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Hi,

I have a postgres DB (can't change the design, not mine) which represents 
is_a relationships by making the primary key column of the child table a 
foreign key to the parent table. So parent and child columns have 
identical primary keys (both called 'id'). Is it possible to use the IsA 
relationship in this situation? 

The C::DBI docs warn about bad things happening if you try to set up has_a
relationships on a primary key - same thing for is_a? I'm getting wierd
errors if I try it. Any suggestions on how to do this? working examples?

Thanks for any help,

Cass