I've found a way to use an idbag which works.
If anybody is interested... here's the coding
Code:
<idbag
name="list_tblAdresse"
lazy="false"
table="tblAdresse">
<collection-id type="Int32" column="ID">
<generator class="hilo"/>
</collection-id>
<key column="ID_Test"/>
<composite-element class="BusinessLayer.Interface.dc_tblAdresse, BusinessLayer.Interface">
<property name="Strasse" column="Strasse"/>
<property name="PLZ" column="PLZ"/>
<property name="Ort" column="Ort"/>
</composite-element>
</idbag>