Hello all, I'm using hibenrate 3.5.1 final and having some problems with saving Set with property-ref configuration.

ClassA is connected to ClassB with Many-to-one called "reference".
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<many-to-one name="reference" column="refObjectid" class="com.msp.dao.entities.Requirement"/>
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The Set in ClassB is related to a Table that have reference to ClassA and the key is configured like that
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<set name="relatedRequirements" inverse="true" table="refcseRelatedRequirements" cascade="none">
<key column="refRequirementAid" property-ref="reference"/>
<many-to-many ..../>
</set>
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When I save the the entity I get errors but when I update it everything is fine and the set is saved perfectly.

Does anyone have any clue what is going on?