Bugfix

src/main/java/it/inaf/ia2/transfer/service/ArchiveService.java

@@ -255,6 +255,11 @@ public class ArchiveService {
         List<String> vosPaths = entryDescriptors.stream().map(ed -> ed.getVosPath())
                 .collect(Collectors.toList());
         
+        if(vosPaths.size() == 1) {            
+            String vosPath = vosPaths.get(0);                        
+            return vosPath.substring(0, vosPath.lastIndexOf("/"));
+        }
+
         String commonParent = null;
         for (String vosPath : vosPaths) {
             if (commonParent == null) {