Add support for relations consist on two or more fileds

Let's say I have following tables:

article

• art_id

article_version

• art_id
• art_version

category

• cat_id

category2article

• cat_id
• art_id

category2article_version

• cat_id
• art_id
• art_version

As I know I can describe relation between tables `article` and `category`, but I cannot describe relation between `artcile_version` and `category`.
The problem is Doctrine supports only following relation mapping:
$this->hasMany('Category as categories', array(
'local' => 'art_id',
'foreign' => 'cat_id',
'refClass' => 'Category2Article'
));

It would be nice to have also something like that:
$this->hasMany('Category as categories', array(
'local' => array('art_id', 'art_version')
'foreign' => 'cat_id',
'refClass' => 'Category2ArticleVc'
));

In the first (supported) example Doctrine produce something like that, when I add LEFT JOIN STATEMENT:
SELECT *
FROM article a
LEFT OUTER JOIN category2article c2a ON c2a.art_id = a.art_id
LEFT OUTER JOIN category c ON c.cat_id = c2a.cat_id

But I would like to have also support for following example:
SELECT *
FROM article_version a_vc
LEFT OUTER JOIN category2article_version c2a_vc ON c2a_vc.art_id = a_vc.art_id AND c2a_vc.art_version = a_vc.art_version
LEFT OUTER JOIN category c ON c.cat_id = c2a_vc.cat_id

–
Very best,
Tomasz Kuter

PS. I will check Doctrine code.. maybe I will solve it by myself..