diff -u b/sources/tmgmt_config/src/ConfigSourcePluginUi.php b/sources/tmgmt_config/src/ConfigSourcePluginUi.php
--- b/sources/tmgmt_config/src/ConfigSourcePluginUi.php
+++ b/sources/tmgmt_config/src/ConfigSourcePluginUi.php
@@ -139,6 +139,8 @@
 
     $row = array(
       'id' => $entity->id(),
+      // If the entity type is FieldConfig, we list the field of the fieldable
+      // entity type which doesn't have a link.
       'title' => $entity->getEntityTypeId() == 'field_config' ? $label : $entity->link($label),
     );
 
@@ -307,6 +309,8 @@
         $items[$item_id]['label'] = $entity->label();
         $items[$item_id]['langcode'] = $entity->language()->getId();
       }
+      // The type cannot be field_config, should be the id of the
+      // fieldable entity type.
       if ($type == 'field_config') {
         $type = $entities[reset($entity_ids)]->get('entity_type') . '_fields';
       }