diff --git a/src/core/js/ext_bottom_line.js b/src/core/js/ext_bottom_line.js
index eba8ea5ceedee46db1a3449beeac994364061036..9227647afd9707793a8a683351c1227861af4798 100644
--- a/src/core/js/ext_bottom_line.js
+++ b/src/core/js/ext_bottom_line.js
@@ -34,7 +34,7 @@
  * `conf/core/json/ext_bottom_line.json`.
  *
  * @module ext_bottom_line
- * @version 0.1
+ * @version 0.1.1
  *
  * @requires jQuery (library)
  * @requires log (singleton from loglevel library)
@@ -165,67 +165,6 @@ var ext_bottom_line = function($, logger, is_in_view_port, load_config, getEntit
             _css_class_preview_container}`)[0];
     }
 
-    /**
-     * Add the element to the entity's preview container and remove all other
-     * content.
-     *
-     * This method appends the element (usually a preview, a waiting
-     * notification or an error message) to the HTMLElement with class
-     * `caosdb-f-ext_bottom_line-container` which was added to the entity by the
-     * {@link root_preview_handler}.
-     *
-     * If the preview container cannot be found an error is logged, but not
-     * thrown.
-     *
-     * @param {HTMLElement|String} element - A preview, a waiting notification,
-     *     an error message or similar.
-     * @param {HTMLElement} entity - An entity in HTML Representation which
-     *     must have a (deep) child with class `caosdb-f-ext_bottom_line-container`.
-     */
-    const set_preview_container = function(entity, element) {
-      // TODO remove
-    }
-
-    /**
-     * Append a preview to the entity and removes any pre-existing preview.
-     *
-     * If the preview is Promise for a preview a waiting notification is added
-     * to the entity instead and the actual preview is added after the Promise
-     * is resolved. If the Promise is rejected, a correspondig error is shown
-     * instead.
-     *
-     * @see root_preview_handler
-     *
-     * @async
-     * @param {HTMLElement} entity
-     * @param {string|HTMLElement|Promise} preview - A preview for an entity or
-     *     a Promise for a preview (which resolves as a string or an HTMLElement as well).
-     */
-    var set_preview = function(entity, preview) {
-      // TODO remove
-    }
-
-    /**
-     * Create and return a preview for a given entity.
-     *
-     * This root_preview_creator iterates over all the registered creators and
-     * uses the first match, i.e. the first creator object which return true
-     * for the `is_applicable(entity)` method of the creator object.
-     *
-     * If a creator throws an error during checking whether it `is_applicable`
-     * or during the `create` the error is logged and the creator is treated as
-     * if it were not applicable.
-     *
-     * @async
-     * @param {HTMLElement} entity - the entity for which the preview is to be
-     *     created.
-     * @returns {String|HTMLElement|Promise} A preview which can be added to
-     *     the entity DOM representation or a Promise for such a preview.
-     */
-    var root_preview_creator = async function(entity) {
-      // TODO remove
-    };
-
     /**
      * Add a preview container to the entity.
      *
@@ -300,7 +239,7 @@ var ext_bottom_line = function($, logger, is_in_view_port, load_config, getEntit
         if (container) {
             await ext_applicable.root_handler(entity, container, _creators);
         } else {
-            logger.error(new Error("Could not find the preview container."));
+            logger.error(new Error("Could not create the preview container."));
         }
     }
 
@@ -319,7 +258,7 @@ var ext_bottom_line = function($, logger, is_in_view_port, load_config, getEntit
      *
      * @param {BottomLineConfig} config
      */
-    var configure = async function(config) {
+    var configure = async function(config, default_config) {
         logger.debug("configure", config);
         if (config.version != "0.1") {
             throw new Error("Wrong version in config.");