persist test fix

model/src/main/java/lcsb/mapviewer/model/map/species/Element.java

@@ -127,6 +127,7 @@ public abstract class Element implements AnnotatedObject, Serializable {
 	 * every compartment then null value is assigned.
 	 */
 	@ManyToOne
+	@Cascade({ CascadeType.SAVE_UPDATE })
 	private Compartment											compartment;
 
 	/**