StoredObject folder = checkExistingObjectId(objectStore, folderId);
checkObjects(so, folder);
Folder parent = (Folder) folder;
MultiFiling obj = (MultiFiling) so;
obj.removeParent(parent);
// To be able to provide all Atom links in the response we need
// additional information:
if (context.isObjectInfoRequired()) {
ObjectInfoImpl objectInfo = new ObjectInfoImpl();