code: protected void checkReferenceable(ImportNodeData currentNodeInfo, String olUuid) throws RepositoryException
     {
        // if node is in version storage - do not assign new id from jcr:uuid
        // property
        if (Constants.JCR_VERSION_STORAGE_PATH.getDepth() + 3 <= currentNodeInfo.getQPath().getDepth()
           && currentNodeInfo.getQPath().getEntries()[Constants.JCR_VERSION_STORAGE_PATH.getDepth() + 3]
              .equals(Constants.JCR_FROZENNODE)
           && currentNodeInfo.getQPath().isDescendantOf(Constants.JCR_VERSION_STORAGE_PATH))
        {
           return;
        }
  
        String identifier = validateUuidCollision(olUuid);
  
        if (identifier != null)
        {
           reloadChangesInfoAfterUC(currentNodeInfo, identifier);
        }
        else
        {
           currentNodeInfo.setIsNewIdentifer(true);
        }
        if (uuidBehavior == ImportUUIDBehavior.IMPORT_UUID_COLLISION_REPLACE_EXISTING)
        {
           NodeData parentNode = getParent();
           currentNodeInfo.setParentIdentifer(parentNode.getIdentifier());
           if (parentNode instanceof ImportNodeData && ((ImportNodeData)parentNode).isTemporary())
           {
              // remove the temporary parent
              tree.pop();
           }
        }
     }
docs: Check uuid collision. If collision happen reload path information.
  
  @param currentNodeInfo
  @param olUuid
  @throws RepositoryException