Nested i18n versionable behaviour

Sorry to bring this up again (http://trac.doctrine-project.org/ticket/1708), but the current ALPHA 3 works perfectly on MySQL and fails on PostgreSQL. I tried the simple wiki example on a fresh project. I posted it already on google groups, but it seems this is the right place for that: http://groups.google.com/group/doctrine-user/browse_thread/thread/32208d921dffb8b3/63eb7337015f4415?show_docid=63eb7337015f4415

This is the generated postgresql sql file:

CREATE TABLE wiki_translation_version (id BIGINT, lang CHAR(2), title VARCHAR(255), content TEXT, version BIGINT, PRIMARY KEY(id, lang, version));
CREATE TABLE wiki_translation_index (id BIGINT, lang CHAR(2), keyword VARCHAR(200), field VARCHAR(50), position BIGINT, PRIMARY KEY(id, lang, keyword, field, position));
CREATE TABLE wiki_translation (id BIGINT, title VARCHAR(255), content TEXT, lang CHAR(2), version BIGINT, slug VARCHAR(255), PRIMARY KEY(id, lang));
CREATE TABLE wiki (id BIGSERIAL, created_at TIMESTAMP NOT NULL, updated_at TIMESTAMP NOT NULL, PRIMARY KEY(id));
CREATE UNIQUE INDEX sluggable ON wiki_translation (slug);
ALTER TABLE wiki_translation_version ADD CONSTRAINT wiki_translation_version_id_wiki_translation_id FOREIGN KEY (id) REFERENCES wiki_translation(id) ON UPDATE CASCADE ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE;
ALTER TABLE wiki_translation_index ADD CONSTRAINT wiki_translation_index_id_wiki_translation_id FOREIGN KEY (id) REFERENCES wiki_translation(id) ON UPDATE CASCADE ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE;
ALTER TABLE wiki_translation ADD CONSTRAINT wiki_translation_id_wiki_id FOREIGN KEY (id) REFERENCES wiki(id) ON UPDATE CASCADE ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE;

The error is:

SQLSTATE[42830]: Invalid foreign key: 7 FEHLER: in Tabelle »wiki_translation«, auf die verwiesen wird, gibt es keinen Unique Constraint, der auf die angegebenen Schlüssel passt. Failing Query: ALTER TABLE wiki_translation_version ADD CONSTRAINT wiki_translation_version_id_wiki_translation_id FOREIGN KEY (id) REFERENCES wiki_translation(id) ON UPDATE CASCADE ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE

It is in german but it means something like: there is no unique constraint in table 'wiki_translation' matching the given key.

Michael