Collation problem

Hi all,
I have a table TranslationDictionary in a database initalized with
lc_collation and lc_type de-de .
In the table is the value 'Straße' and I can't insert 'Strasse', but
when I try to create a foreign key on this table, the value 'Strasse' in
the foreign table is unmatched.
Is this a bug, or have I done something wrong?

\d TranslationDictionary
Table "translationdictionary"
Column | Type | Modifiers
----------------+----------------+-----------
ckeydictionary | character(250) | not null
cvalue | character(250) |
Indexes:
"translationdictionary_pkey" PRIMARY KEY, btree (ckeydictionary)

insert into tkp.TranslationDictionary (cKeyDictionary, cValue) values
('Strasse', 'Strasse');
ERROR: duplicate key violates unique constraint
"translationdictionary_pkey"

select * from tkp.TranslationDictionary where cKeyDictionary = 'Strasse';
ckeydictionary | cvalue
----------------+--------
(0 rows)

Andrei

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