Fix delete relation

geoportal-service/src/main/java/org/gcube/application/geoportal/service/engine/mongo/ProfiledMongoManager.java

@@ -386,7 +386,7 @@ public class ProfiledMongoManager extends MongoManager implements MongoManagerI<
                         // delete reverse relation
                         if(toDeleteReverseRelation!=null){
                             log.debug("Removing reverse of {} ",r);
-                            ProfiledMongoManager otherManager = (targetUCD.equals(this.useCaseDescriptor.getId()))?this:new ProfiledMongoManager(targetUCD);
+                            ProfiledMongoManager otherManager = (toUseTargetUCD.equals(this.useCaseDescriptor.getId()))?this:new ProfiledMongoManager(targetUCD);
                             Project other = getByID(targetId);
                             other = otherManager.lock(other.getId(),"Remove reverse relation "+toDeleteReverseRelation + " toward "+getUseCaseDescriptor().getId()+":"+id);
                             final String finalToDeleteReverseRelation = toDeleteReverseRelation;