EDIT

        listToUpdate.clear();

        List<TermTreeDto> rootEntities = getRootEntities();

        CdmStore.getService(ITermTreeService.class).saveOrUpdateTermTreeDtoList(rootEntities);

        conversation.commit(true);

//        initializeTrees();

		    	TermNodeDto droppedNode = editor.getNodeDtoForUuid(((TermNodeDto) droppedObject).getUuid());

		        TermNodeDto oldParent = editor.getNodeDtoForUuid(droppedNode.getParentUuid());

		        boolean isCircle = checkCircle(droppedNode, target);

		            return false;

		        }

		        int currentPosition = oldParent.getIndex(droppedNode);

     */

    private boolean checkCircle(TermNodeDto droppedNode, TermNodeDto newParent) {

        boolean result = false;

           return true;

       }

       if (newParent.getParentUuid() != null){

           result = checkCircle(droppedNode, editor.getNodeDtoForUuid(newParent.getParentUuid()));

        if(target instanceof TermTreeDto && getCurrentLocation()!=ViewerDropAdapter.LOCATION_ON){

            isSupported = false;

        }

        return isSupported;

    }

import eu.etaxonomy.taxeditor.featuretree.e4.operation.AddFeatureOperation;

import eu.etaxonomy.taxeditor.l10n.Messages;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

/**

 * @author k.luther

            @Named(IServiceConstants.ACTIVE_SELECTION)IStructuredSelection selection,

            UISynchronize sync) {

        IFeatureTreeEditor editor = ((IFeatureTreeEditor) thisPart.getObject());

        TermNodeDto parent = getParent(selection);

        TermType type = null;

        if (parent.getTerm() == null){