diff --git a/lib/Alchemy/Phrasea/Controller/Admin/FieldsController.php b/lib/Alchemy/Phrasea/Controller/Admin/FieldsController.php
index 02822d9228..51ac40ab51 100644
--- a/lib/Alchemy/Phrasea/Controller/Admin/FieldsController.php
+++ b/lib/Alchemy/Phrasea/Controller/Admin/FieldsController.php
@@ -314,6 +314,8 @@ class FieldsController extends Controller
             ->set_readonly($data['readonly'])
             ->set_type($data['type'])
             ->set_tbranch($data['tbranch'])
+            ->set_generate_cterms($data['generate_cterms'])
+            ->set_gui_editable($data['gui_editable'])
             ->set_report($data['report'])
             ->setVocabularyControl(null)
             ->setVocabularyRestricted(false);
@@ -349,7 +351,7 @@ class FieldsController extends Controller
     {
         return [
             'name', 'multi', 'thumbtitle', 'tag', 'business', 'indexable', 'aggregable',
-            'required', 'separator', 'readonly', 'type', 'tbranch', 'report',
+            'required', 'separator', 'readonly', 'gui_editable', 'type', 'tbranch', 'generate_cterms', 'report',
             'vocabulary-type', 'vocabulary-restricted', 'dces-element', 'labels'
         ];
     }
diff --git a/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php b/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php
index 39361d46da..0c3bffb63e 100644
--- a/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php
+++ b/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php
@@ -594,6 +594,8 @@ class V1Controller extends Controller
                 ],
                 'separator'        => $databox_field->get_separator(),
                 'thesaurus_branch' => $databox_field->get_tbranch(),
+                'generate_cterms'  => $databox_field->get_generate_cterms(),
+                'gui_editable'     => $databox_field->get_gui_editable(),
                 'type'             => $databox_field->get_type(),
                 'indexable'        => $databox_field->is_indexable(),
                 'multivalue'       => $databox_field->is_multi(),
diff --git a/lib/Alchemy/Phrasea/Controller/Prod/EditController.php b/lib/Alchemy/Phrasea/Controller/Prod/EditController.php
index 849c5af046..e164221a51 100644
--- a/lib/Alchemy/Phrasea/Controller/Prod/EditController.php
+++ b/lib/Alchemy/Phrasea/Controller/Prod/EditController.php
@@ -75,6 +75,8 @@ class EditController extends Controller
                     'format'               => '',
                     'explain'              => '',
                     'tbranch'              => $meta->get_tbranch(),
+                    'generate_cterms'       => $meta->get_generate_cterms(),
+                    'gui_editable'         => $meta->get_gui_editable(),
                     'maxLength'            => $meta->get_tag()
                         ->getMaxLength(),
                     'minLength'            => $meta->get_tag()
diff --git a/lib/Alchemy/Phrasea/Core/Version.php b/lib/Alchemy/Phrasea/Core/Version.php
index 0e15108724..c525bf815c 100644
--- a/lib/Alchemy/Phrasea/Core/Version.php
+++ b/lib/Alchemy/Phrasea/Core/Version.php
@@ -16,7 +16,7 @@ class Version
     /**
      * @var string
      */
-    private $number = '4.1.0-alpha.15a';
+    private $number = '4.1.0-alpha.17a';
 
     /**
      * @var string
diff --git a/lib/Alchemy/Phrasea/Databox/Field/DbalDataboxFieldRepository.php b/lib/Alchemy/Phrasea/Databox/Field/DbalDataboxFieldRepository.php
index a8209285ca..5f7e210a76 100644
--- a/lib/Alchemy/Phrasea/Databox/Field/DbalDataboxFieldRepository.php
+++ b/lib/Alchemy/Phrasea/Databox/Field/DbalDataboxFieldRepository.php
@@ -36,6 +36,8 @@ final class DbalDataboxFieldRepository implements DataboxFieldRepository
         'label_fr',
         'label_de',
         'label_nl',
+        'generate_cterms',
+        'gui_editable',
     ];
 
     /** @var DataboxFieldFactory */
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Indexer/Record/Hydrator/ThesaurusHydrator.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Indexer/Record/Hydrator/ThesaurusHydrator.php
index 4107285ac2..6f6c502151 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Indexer/Record/Hydrator/ThesaurusHydrator.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Indexer/Record/Hydrator/ThesaurusHydrator.php
@@ -42,7 +42,7 @@ class ThesaurusHydrator implements HydratorInterface
         $fields = [];
         $index_fields = [];
         foreach ($structure as $name => $field) {
-            $fields[$name] = $field->getThesaurusRoots();
+            $fields[$name] = $field; // ->getThesaurusRoots();
             $index_fields[$name] = $field->getIndexField();
         }
         // Hydrate records with concepts
@@ -51,7 +51,13 @@ class ThesaurusHydrator implements HydratorInterface
         }
     }
 
-    private function hydrate(array &$record, array $fields, array $index_fields)
+    /**
+     * @param array $record
+     * @param  Field[] $fields
+     * @param array $index_fields
+     * @throws Exception
+     */
+    private function hydrate(array &$record, $fields, array $index_fields)
     {
         if (!isset($record['databox_id'])) {
             throw new Exception('Expected a record with the "databox_id" key set.');
@@ -61,7 +67,8 @@ class ThesaurusHydrator implements HydratorInterface
         $terms = array();
         $filters = array();
         $field_names = array();
-        foreach ($fields as $name => $root_concepts) {
+        foreach ($fields as $name => $field) {
+            $root_concepts = $field->getThesaurusRoots();
             // Loop through all values to prepare bulk query
             $field_values = \igorw\get_in($record, explode('.', $index_fields[$name]));
             if ($field_values !== null) {
@@ -84,13 +91,17 @@ class ThesaurusHydrator implements HydratorInterface
         $bulk = $this->thesaurus->findConceptsBulk($terms, null, $filters, true);
 
         foreach ($bulk as $offset => $item_concepts) {
+            $name = $field_names[$offset];
             if ($item_concepts && is_array($item_concepts) && count($item_concepts)>0) {
-                $name = $field_names[$offset];
                 foreach ($item_concepts as $concept) {
                     $record['concept_path'][$name][] = $concept->getPath();
                 }
-            } else {
-                $this->candidate_terms->insert($field_names[$offset], $values[$offset]);
+            }
+            else {
+                $field = $fields[$name];
+                if($field->get_generate_cterms()) {
+                    $this->candidate_terms->insert($field_names[$offset], $values[$offset]);
+                }
             }
         }
     }
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Field.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Field.php
index 3b71f6f451..f2dc5d0e7b 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Field.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Structure/Field.php
@@ -43,6 +43,8 @@ class Field implements Typed
 
     private $thesaurus_roots;
 
+    private $generate_cterms;
+
     private $used_by_collections;
 
     public static function createFromLegacyField(databox_field $field, $with = Structure::WITH_EVERYTHING)
@@ -75,6 +77,7 @@ class Field implements Typed
             'private' => $field->isBusiness(),
             'facet' => $facet,
             'thesaurus_roots' => $roots,
+            'generate_cterms' => $field->get_generate_cterms(),
             'used_by_collections' => $databox->get_collection_unique_ids()
         ]);
     }
@@ -103,6 +106,7 @@ class Field implements Typed
         $this->is_private      = \igorw\get_in($options, ['private'], false);
         $this->facet           = \igorw\get_in($options, ['facet']);
         $this->thesaurus_roots = \igorw\get_in($options, ['thesaurus_roots'], null);
+        $this->generate_cterms  = \igorw\get_in($options, ['generate_cterms'], false);
         $this->used_by_collections = \igorw\get_in($options, ['used_by_collections'], []);
 
         Assertion::boolean($this->is_searchable);
@@ -126,6 +130,7 @@ class Field implements Typed
             'private' => $this->is_private,
             'facet' => $this->facet,
             'thesaurus_roots' => $this->thesaurus_roots,
+            'generate_cterms' => $this->generate_cterms,
             'used_by_collections' => $this->used_by_collections
         ]);
     }
@@ -190,6 +195,11 @@ class Field implements Typed
         return $this->thesaurus_roots;
     }
 
+    public function get_generate_cterms()
+    {
+        return $this->generate_cterms;
+    }
+
     /**
      * Merge with another field, returning the new instance
      *
diff --git a/lib/classes/databox.php b/lib/classes/databox.php
index c02ef4ffba..01aa2eea31 100644
--- a/lib/classes/databox.php
+++ b/lib/classes/databox.php
@@ -462,6 +462,8 @@ class databox extends base implements ThumbnailedElement
                 ->set_aggregable((isset($field['aggregable']) ? (string) $field['aggregable'] : 0))
                 ->set_type($type)
                 ->set_tbranch(isset($field['tbranch']) ? (string) $field['tbranch'] : '')
+                ->set_generate_cterms((isset($field['generate_cterms']) && (string) $field['generate_cterms'] == 1))
+                ->set_gui_editable((isset($field['gui_editable']) && (string) $field['gui_editable'] == 1))
                 ->set_thumbtitle(isset($field['thumbtitle']) ? (string) $field['thumbtitle'] : (isset($field['thumbTitle']) ? $field['thumbTitle'] : '0'))
                 ->set_report(isset($field['report']) ? (string) $field['report'] : '1')
                 ->save();
@@ -1214,21 +1216,40 @@ class databox extends base implements ThumbnailedElement
             $domct = $this->get_dom_cterms();
 
             if ($domct !== false) {
+                $changed = false;
                 $nodesToDel = [];
+                // loop on first level : "fields"
                 for($n = $domct->documentElement->firstChild; $n; $n = $n->nextSibling) {
                     if($n->nodeType == XML_ELEMENT_NODE && !($n->getAttribute('delbranch'))){
-                        $nodesToDel[] = $n;
+                        $nodesToDel2 = [];
+                        // loop on 2nd level : "terms"
+                        for($n2 = $n->firstChild; $n2; $n2 = $n2->nextSibling) {
+                            // do not remove "rejected" candidates
+                            if(substr($n2->getAttribute('id'), 0, 1) != 'R') {
+                                $nodesToDel2[] = $n2;
+                            }
+                        }
+                        foreach($nodesToDel2 as $n2) {
+                            $n->removeChild($n2);
+                            $changed = true;
+                        }
+                        // if a field has no more candidates, we can remove it
+                        if(!($n->firstChild)) {
+                            $nodesToDel[] = $n;
+                        }
                     }
                 }
                 foreach($nodesToDel as $n) {
                     $n->parentNode->removeChild($n);
+                    $changed = true;
                 }
-                if(!empty($nodesToDel)) {
+                if($changed) {
                     $this->saveCterms($domct);
                 }
             }
-        } catch (\Exception $e) {
-
+        }
+        catch (\Exception $e) {
+            // no-op
         }
     }
 
diff --git a/lib/classes/databox/field.php b/lib/classes/databox/field.php
index 35fc525265..09dab67d46 100644
--- a/lib/classes/databox/field.php
+++ b/lib/classes/databox/field.php
@@ -43,6 +43,8 @@ class databox_field implements cache_cacheableInterface
     protected $report;
     protected $type;
     protected $tbranch;
+    protected $generate_cterms;
+    protected $gui_editable;
     protected $separator;
     protected $thumbtitle;
 
@@ -166,6 +168,8 @@ class databox_field implements cache_cacheableInterface
         $this->position = (int)$row['sorter'];
         $this->type = $row['type'] ?: self::TYPE_STRING;
         $this->tbranch = $row['tbranch'];
+        $this->generate_cterms = (bool)$row['generate_cterms'];
+        $this->gui_editable = (bool)$row['gui_editable'];
         $this->VocabularyType = $row['VocabularyControlType'];
         $this->VocabularyRestriction = (bool)$row['RestrictToVocabularyControl'];
 
@@ -306,6 +310,8 @@ class databox_field implements cache_cacheableInterface
           `report` = :report,
           `type` = :type,
           `tbranch` = :tbranch,
+          `generate_cterms` = :generate_cterms,
+          `gui_editable` = :gui_editable,
           `sorter` = :position,
           `thumbtitle` = :thumbtitle,
           `VocabularyControlType` = :VocabularyControlType,
@@ -329,6 +335,8 @@ class databox_field implements cache_cacheableInterface
             ':report'                => $this->report ? '1' : '0',
             ':type'                  => $this->type,
             ':tbranch'               => $this->tbranch,
+            ':generate_cterms'        => $this->generate_cterms ? '1' : '0',
+            ':gui_editable'          => $this->gui_editable ? '1' : '0',
             ':position'              => $this->position,
             ':thumbtitle'            => $this->thumbtitle,
             ':VocabularyControlType' => $this->getVocabularyControl() ? $this->getVocabularyControl()->getType() : null,
@@ -380,6 +388,8 @@ class databox_field implements cache_cacheableInterface
         $meta->setAttribute('aggregable', $this->aggregable);
         $meta->setAttribute('type', $this->type);
         $meta->setAttribute('tbranch', $this->tbranch);
+        $meta->setAttribute('generate_cterms', $this->generate_cterms ? '1' : '0');
+        $meta->setAttribute('gui_editable', $this->gui_editable ? '1' : '0');
         if ($this->multi) {
             $meta->setAttribute('separator', $this->separator);
         }
@@ -711,6 +721,28 @@ class databox_field implements cache_cacheableInterface
         return $this;
     }
 
+    /**
+     * @param  boolean       $generate_cterms
+     * @return databox_field
+     */
+    public function set_generate_cterms($generate_cterms)
+    {
+        $this->generate_cterms = $generate_cterms;
+
+        return $this;
+    }
+
+    /**
+     * @param  boolean       $gui_editable
+     * @return databox_field
+     */
+    public function set_gui_editable($gui_editable)
+    {
+        $this->gui_editable = $gui_editable;
+
+        return $this;
+    }
+
     /**
      *
      * @param  string        $separator
@@ -795,6 +827,24 @@ class databox_field implements cache_cacheableInterface
         return $this->tbranch;
     }
 
+    /**
+     *
+     * @return boolean
+     */
+    public function get_generate_cterms()
+    {
+        return $this->generate_cterms;
+    }
+
+    /**
+     *
+     * @return boolean
+     */
+    public function get_gui_editable()
+    {
+        return $this->gui_editable;
+    }
+
     /**
      * @param Boolean $all If set to false, returns a one-char separator to use for serialiation
      *
@@ -905,6 +955,8 @@ class databox_field implements cache_cacheableInterface
             'sorter'                => $this->position,
             'thumbtitle'            => $this->thumbtitle,
             'tbranch'               => $this->tbranch,
+            'generate_cterms'        => $this->generate_cterms,
+            'gui_editable'          => $this->gui_editable,
             'separator'             => $this->separator,
             'required'              => $this->required,
             'report'                => $this->report,
@@ -943,10 +995,10 @@ class databox_field implements cache_cacheableInterface
         }
 
         $sql = "INSERT INTO metadatas_structure
-        (`id`, `name`, `src`, `readonly`, `required`, `indexable`, `type`, `tbranch`,
+        (`id`, `name`, `src`, `readonly`, `gui_editable`, `required`, `indexable`, `type`, `tbranch`, `generate_cterms`,
           `thumbtitle`, `multi`, `business`, `aggregable`,
           `report`, `sorter`, `separator`)
-        VALUES (null, :name, '', 0, 0, 1, 'string', '',
+        VALUES (null, :name, '', 0, 1, 0, 1, 'string', '', 1,
           null, 0, 0, 0,
            1, :sorter, '')";
 
diff --git a/lib/classes/patch/410alpha17a.php b/lib/classes/patch/410alpha17a.php
new file mode 100644
index 0000000000..ff682b1ef9
--- /dev/null
+++ b/lib/classes/patch/410alpha17a.php
@@ -0,0 +1,67 @@
+<?php
+
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2016 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Alchemy\Phrasea\Application;
+
+class patch_410alpha17a implements patchInterface
+{
+    /** @var string */
+    private $release = '4.1.0-alpha.17a';
+
+    /** @var array */
+    private $concern = [base::DATA_BOX];
+
+    /**
+     * {@inheritdoc}
+     */
+    public function get_release()
+    {
+        return $this->release;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDoctrineMigrations()
+    {
+        return [];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function require_all_upgrades()
+    {
+        return false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function concern()
+    {
+        return $this->concern;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function apply(base $databox, Application $app)
+    {
+        // -- done by xml schema --
+        // $sql = "ALTER TABLE `metadatas_structure` ADD `generate_cterms` INT(1)  UNSIGNED  NOT NULL  DEFAULT '0' AFTER `tbranch`";
+        // $databox->get_connection()->executeQuery($sql);
+        // $sql = "ALTER TABLE `metadatas_structure` ADD `gui_editable` INT(1)  UNSIGNED  NOT NULL  DEFAULT '0' AFTER `readonly`";
+        // $databox->get_connection()->executeQuery($sql);
+
+        return true;
+    }
+}
diff --git a/lib/conf.d/bases_structure.xml b/lib/conf.d/bases_structure.xml
index a666eaeb5c..b989e2f9d6 100644
--- a/lib/conf.d/bases_structure.xml
+++ b/lib/conf.d/bases_structure.xml
@@ -2033,6 +2033,22 @@
             <default></default>
             <comment></comment>
           </field>
+          <field>
+            <name>generate_cterms</name>
+            <type>int(1) unsigned</type>
+            <null></null>
+            <extra></extra>
+            <default>1</default>
+            <comment></comment>
+          </field>
+          <field>
+            <name>gui_editable</name>
+            <type>int(1) unsigned</type>
+            <null></null>
+            <extra></extra>
+            <default>1</default>
+            <comment></comment>
+          </field>
         </fields>
         <indexes>
           <index>
diff --git a/templates/web/admin/fields/templates.html.twig b/templates/web/admin/fields/templates.html.twig
index c785a9a701..191f3f18b8 100644
--- a/templates/web/admin/fields/templates.html.twig
+++ b/templates/web/admin/fields/templates.html.twig
@@ -189,6 +189,14 @@
                         </label>
                     </td>
                 </tr>
+                <tr>
+                    <td>
+                        <label for="gui_editable" class="checkbox">
+                            <input id="gui_editable" type="checkbox" <%= field.gui_editable ? "checked='checked'" : "" %> />
+                            {% trans %}gui_editable{% endtrans %}
+                        </label>
+                    </td>
+                </tr>
                 <tr>
                     <td colspan="2">
                         <label for="business" class="checkbox">
@@ -247,6 +255,10 @@
                     <td><label for="tbranch">{% trans %}Thesaurus branch{% endtrans %}</label></td>
                     <td><input id="tbranch" type="text" value="<%= field.tbranch %>"/></td>
                 </tr>
+                <tr>
+                    <td><label for="generate_cterms" class="checkbox">{% trans %}generate_cterms{% endtrans %}</label></td>
+                    <td><input id="generate_cterms" type="checkbox" <%= field.generate_cterms ? "checked='checked'" : "" %> /></td>
+                </tr>
             </table>
         </div>
     </div>
diff --git a/tests/Alchemy/Tests/Phrasea/Controller/Admin/FieldsTest.php b/tests/Alchemy/Tests/Phrasea/Controller/Admin/FieldsTest.php
index e13f9e4e9a..dde4d2f9c6 100644
--- a/tests/Alchemy/Tests/Phrasea/Controller/Admin/FieldsTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Controller/Admin/FieldsTest.php
@@ -229,6 +229,8 @@ class FieldsTest extends \PhraseanetAuthenticatedWebTestCase
             'dces-element' => null,
             'vocabulary-type' => 'User',
             'vocabulary-restricted' => true,
+            'gui_editable' => true,
+            'generate_cterms' => true,
         ]);
 
         $response = $this->request("POST", sprintf("/admin/fields/%d/fields", $databox->get_sbas_id()), [], [], $body);
diff --git a/www/scripts/models/field.js b/www/scripts/models/field.js
index e4b603ee75..cf895456c1 100644
--- a/www/scripts/models/field.js
+++ b/www/scripts/models/field.js
@@ -26,6 +26,8 @@ define([
             "type": "string",
             "thumbtitle": "0",
             "tbranch": "",
+            "generate_cterms": false,
+            "gui_editable": true,
             "separator": "",
             "required": false,
             "report": true,
diff --git a/www/scripts/tests/specs/models.js b/www/scripts/tests/specs/models.js
index bf4c240779..aaa15c61c4 100644
--- a/www/scripts/tests/specs/models.js
+++ b/www/scripts/tests/specs/models.js
@@ -44,6 +44,14 @@ define([
                     this.field.get('tbranch').should.equal("");
                 });
 
+                it("should default generate_cterms property to '1'", function () {
+                    this.field.get('generate_cterms').should.equal("1");
+                });
+
+                it("should default gui_editable property to '1'", function () {
+                    this.field.get('gui_editable').should.equal("1");
+                });
+
                 it("should default separator property to 'empty'", function () {
                     this.field.get('separator').should.equal("");
                 });