props.setProperty("CASCADE_POLICY_ON_CONTAINMENT",
				"REMOVE,REFRESH,PERSIST,MERGE");

Product product = ShopFactory.eINSTANCE.createProduct();
		product.setName("testProduct");
		product.setNumber(1);

		ProductCategory root = ShopFactory.eINSTANCE.createProductCategory();
		root.setName("root");
		getProductsResource().getContents().add(root);
		saveResources();

		ProductCategory node1 = ShopFactory.eINSTANCE.createProductCategory();
		node1.setName("node1");
		root.getSubCategorys().add(node1);
		node1.getProducts().add(product);
		saveResources();

		ProductCategory node2 = ShopFactory.eINSTANCE.createProductCategory();
		node2.setName("node2");
		root.getSubCategorys().add(node2);
		saveResources();
		product.setProductCategory(node2);
		saveResources();

<list name="products" lazy="true" cascade="all,delete-orphan">
			<key update="true">
				<column name="`product_productcategory_e_id`" not-null="false" unique="false"/>
			</key>
			<list-index column="`productcategory_products_idx`"/>
			<one-to-many entity-name="Product"/>
		</list>

		int ops = DND.DROP_COPY | DND.DROP_MOVE;
		Transfer[] transfers = new Transfer[] { TextTransfer.getInstance() };
		tree.getViewer().addDragSupport(ops, transfers,
				new ViewerDragAdapter(tree.getViewer()) {
					@Override
					public void dragSetData(DragSourceEvent event) {
						event.data = String.class.getName(); //any string!!
					}
				});

		tree.getViewer().addDropSupport(ops, transfers,
				new ViewerDropAdapter(tree.getViewer()) {

					@Override
					public boolean validateDrop(Object target, int operation,
							TransferData transferType) {
						return target instanceof ProductCategory;
					}

					@SuppressWarnings("unchecked")
					@Override
					public boolean performDrop(final Object data) {
						IStructuredSelection selection = (IStructuredSelection) tree
								.getViewer().getSelection();
						List selectedObjects = selection.toList();
								for (Object obj : selectedObjects) {
									if (obj instanceof ProductCategory)
										((ProductCategory) obj)
												.setParent((ProductCategory) getCurrentTarget());
									if (obj instanceof Product)
										((Product) obj)
												.setProductCategory((ProductCategory) getCurrentTarget());
								}
						return true;
					}
				});