Hibernate version: 3.0.5

Having two tables:

TBFRUITS
________
ID_FRUIT
ID_COLOR


TBTRANSLATECOLORS
_________________
ID_COLOR
ID_LANGUAGE


I'm desesperatelly trying to make a left outer join with only a primary key on the left joined table, but hibernate obligates me to put all primery keys on the hbm


tbfruits.hbm.xml
<many-to-one name="tbtranslatecolors" class="com.mymodel.dto.Tbtranslatecolors" fetch="select">
<column name="ID_COLOR" length="7" />
<column name="ID_LANGUAGE" length="3" />
</many-to-one>


the following HQL:


FROM
com.mymodel.dto.Tbfruits AS tf
left join fetch tf.tbtranslatecolors AS tc


produces a left join for both primary keys on the left joined tbtranslate colors but I only ONE COLUMN so trying to left join ON ID_COLOR


FROM
com.mymodel.dto.Tbfruits AS tf
left join fetch tf.tbtranslatecolors AS tc
on tf.idcolor = tc.idcolor


but this produces a


org.hibernate.hql.ast.QuerySyntaxException: unexpected token: on near line 4, column 1


So how can I obligate HQL to produce a left join only on id_color ?

TIA