Referential Integrity problem

Running PG 7.1.3...
I have a table of titles and suffixes, with periods (i.e. Mr. Mrs. C.P.A.)
There is a foreign key between the title and suffix tables, and my
patient table.
When I do an insert, it fails on Referential Integrity (RI).
If I take the periods out, the insert works with RI.
If I remove the RI, then the periods work.

Is this a bug?
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_________________________
Herb Blacker
Database Administrator
ReCare, Inc.
(512) 791-4340
herbblacker@isgenesis.com