Incorrect query for inherited many-to-many relation

Column Aggregation Inheritance, Many to Many

Inspired by post on symfonyexperts.com (http://symfonyexperts.com/question/show/id/48) I tried to setup a similar scenario whith 1 'Entity' Model and many-to-many relations between them.
The different types of relations between them are implemented by inheritance.

It seems that Doctrine is omitting the type of the key field in the generated queries.
I put up an example to reproduce it:

Model (YAML)
---------------------------------------
Entity:
columns:
name:

{ type: varchar(20) }

relations:
Owners:

{ class: Entity, local: src_entity_id, foreign: dst_entity_id, refClass: EntityRelationOwner }

Compatibles:

{ class: Entity, local: src_entity_id, foreign: dst_entity_id, refClass: EntityRelationCompatible }

EntityRelation:
columns:
src_entity_id:

{ type: integer(4), primary: true }

dst_entity_id:

{ type: integer(4), primary: true }

type:

{ type: string(10) }

EntityRelationOwner:
inheritance:
extends: EntityRelation
type: column_aggregation
keyField: type
keyValue: owner

EntityRelationCompatible:
inheritance:
extends: EntityRelation
type: column_aggregation
keyField: type
keyValue: compatible

Action:
---------------------------------------
..
$entity = Doctrine::getTable('Entity')->find(1);
$entity->getOwners()
..

SQL:
---------------------------------------
SELECT entity.id AS entity__id,
entity.name AS entity__name,
entity_relation.src_entity_id AS entity_relation__src_entity_id,
entity_relation.dst_entity_id AS entity_relation__dst_entity_id,
entity_relation.type AS entity_relation__type
FROM entity
INNER JOIN entity_relation ON entity.id = entity_relation.dst_entity_id
WHERE entity.id IN (
SELECT dst_entity_id FROM entity_relation WHERE src_entity_id = '1'
)
ORDER BY entity.id ASC

To my understanding, the inner SQL statement is missing the type restriction and should be:

SELECT dst_entity_id FROM entity_relation WHERE src_entity_id = '1' AND type = 'owner'