diff --git a/lib/Alchemy/Phrasea/Controller/Prod/ToolsController.php b/lib/Alchemy/Phrasea/Controller/Prod/ToolsController.php
index cd1597b213..a29df18969 100644
--- a/lib/Alchemy/Phrasea/Controller/Prod/ToolsController.php
+++ b/lib/Alchemy/Phrasea/Controller/Prod/ToolsController.php
@@ -103,7 +103,15 @@ public function indexAction(Request $request)
         /** @var record_adapter $rec */
         foreach ($records as $rec) {
 
-            $databoxSubdefs = $rec->getDatabox()->get_subdef_structure()->getSubdefGroup($rec->getType());
+            $recordType = $rec->getType();
+
+            // if record type is unknown
+            // use the type 'document' setting
+            if ($recordType == 'unknown') {
+                $recordType = 'document';
+            }
+
+            $databoxSubdefs = $rec->getDatabox()->get_subdef_structure()->getSubdefGroup($recordType);
             if ($databoxSubdefs !== null) {
                 foreach ($databoxSubdefs as $sub) {
                     if ($sub->isTobuild()) {
diff --git a/lib/Alchemy/Phrasea/Media/SubdefSubstituer.php b/lib/Alchemy/Phrasea/Media/SubdefSubstituer.php
index 2fd8f573da..c1fd3fd9fc 100644
--- a/lib/Alchemy/Phrasea/Media/SubdefSubstituer.php
+++ b/lib/Alchemy/Phrasea/Media/SubdefSubstituer.php
@@ -99,6 +99,9 @@ public function substituteSubdef(\record_adapter $record, $name, MediaInterface
         }
 
         $type = $record->isStory() ? 'image' : $record->getType();
+
+        $type = ($type == 'unknown') ? 'document' :  $type;
+
         $databox_subdef = $record->getDatabox()->get_subdef_structure()->get_subdef($type, $name);
 
         if ($this->isOldSubdefPresent($record, $name)) {
diff --git a/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php b/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php
index 2447a8211d..a7363ebf2a 100644
--- a/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php
+++ b/lib/Alchemy/Phrasea/Twig/PhraseanetExtension.php
@@ -323,6 +323,12 @@ public function getDoctypeIcon(RecordInterface $record)
                 $src = '/assets/common/images/icons/icon_flash.png';
                 $title = $this->app['translator']->trans('flash');
                 break;
+            case 'unknown':
+                if ($record->getMimeType() == 'application/zip') {
+                    $src = '/assets/common/images/icons/substitution/application_zip.png';
+                    $title = $this->app['translator']->trans('zip');
+                }
+                break;
         }
 
         return sprintf('<img src="%s" title="%s" />', $src, $title);
diff --git a/lib/classes/ACL.php b/lib/classes/ACL.php
index 18f98f6b18..58d7415e5b 100644
--- a/lib/classes/ACL.php
+++ b/lib/classes/ACL.php
@@ -525,8 +525,14 @@ public function has_access_to_subdef(RecordInterface $record, $subdef_name)
 
         $databox = $this->app->findDataboxById($record->getDataboxId());
         try {
+            $recordType = $record->getType();
+
+            if ($recordType == 'unknown') {
+                $recordType = 'document';
+            }
+
             $subdef_class = $databox->get_subdef_structure()
-                ->get_subdef($record->getType(), $subdef_name)
+                ->get_subdef($recordType, $subdef_name)
                 ->get_class();
         } catch (\Exception $e) {
             return false;
diff --git a/lib/classes/record/exportElement.php b/lib/classes/record/exportElement.php
index 7de7eefe69..7d9ba0d205 100644
--- a/lib/classes/record/exportElement.php
+++ b/lib/classes/record/exportElement.php
@@ -89,7 +89,7 @@ protected function get_actions($userOwner)
         $subdefs = [];
 
         foreach ($this->app->findDataboxById($sbas_id)->get_subdef_structure() as $subdef_type => $subdefs_obj) {
-            if ($subdef_type == $this->getType()) {
+            if ($subdef_type == $this->getType() || ($this->getType() == 'unknown') && $subdef_type == 'document') {
                 $subdefs = $subdefs_obj;
                 break;
             }
diff --git a/templates/web/prod/actions/Tools/index.html.twig b/templates/web/prod/actions/Tools/index.html.twig
index 9740756b84..cf8a9f144d 100644
--- a/templates/web/prod/actions/Tools/index.html.twig
+++ b/templates/web/prod/actions/Tools/index.html.twig
@@ -150,53 +150,47 @@
         {% if substituables|length > 0 %}       {# substituables is empty if multiple records #}
             {% for record in records %}
                 <div id="substitution" class="tabBox">
+                    {% for substituable in substituables %}
+                        {% set d = (substituable == "document") ? true : false %}
+                        <div id="substitution-hd">
+                            <form
+                                    name="formchgHD"
+                                    action="{{ path(d ? 'prod_tools_hd_substitution' : 'prod_tools_thumbnail_substitution') }}"
+                                    enctype="multipart/form-data"
+                                    method="post"
+                                    target="uploadHdsub">
 
-                    {% if "unknown" == record.get_type() %}
-                        <i class="fa fa-exclamation-triangle icon-white"
-                           aria-hidden="true"></i>{{ "Substitution is not possible for this kind of record" | trans }}
-                    {% else %}
-                        {% for substituable in substituables %}
-                            {% set d = (substituable == "document") ? true : false %}
-                            <div id="substitution-hd">
-                                <form
-                                        name="formchgHD"
-                                        action="{{ path(d ? 'prod_tools_hd_substitution' : 'prod_tools_thumbnail_substitution') }}"
-                                        enctype="multipart/form-data"
-                                        method="post"
-                                        target="uploadHdsub">
-
-                                    <fieldset style='border:1px solid #999;padding:20px;'>
-                                        <legend>&nbsp;
-                                            <b>{% trans with {'%sd%' : substituable} %}substitution of %sd%{% endtrans %}</b>&nbsp
-                                        </legend>
-                                        <div>
-                                            {% if d %}
-                                                <input id='new-hd-file' name="newHD" type="file"/>
-                                                <br/>
-                                                <label for="CCFNALP" class="checkbox">
-                                                    <input type="checkbox" name="ccfilename" id="CCFNALP" value="1">
-                                                    {{ "mettre a jour le nom original de fichier apres substitution" | trans }}
-                                                </label>
-                                                <input type="hidden" name="prodToolsHDSubstitution_token" value="{{ app['session'].get('prodToolsHDSubstitution_token') }}">
-                                            {% else %}
-                                                <input id='new-sd-file' name="newThumb" type="file"/>
-                                                <input type="hidden" name="prodToolsThumbSubstitution_token" value="{{ app['session'].get('prodToolsThumbSubstitution_token') }}">
-                                            {% endif %}
-                                            <input type="hidden" name="subdef" value="{{ substituable|e }}"/>
-                                            <input type="hidden" name="sbas_id" value="{{ record.get_sbas_id() }}"/>
-                                            <input type="hidden" name="record_id" value="{{ record.get_record_id() }}"/>
-                                            <div class="load"></div>
-                                            <div class='resultAction'></div>
-                                        </div>
-                                    </fieldset>
-                                    <div style='text-align:right;padding-top:10px;'>
-                                        <button class="iframe_submiter btn btn-inverse">{{ "validate" | trans }}</button>
-                                        <button class="action_cancel btn btn-inverse">{{ "cancel" | trans }}</button>
+                                <fieldset style='border:1px solid #999;padding:20px;'>
+                                    <legend>&nbsp;
+                                        <b>{% trans with {'%sd%' : substituable} %}substitution of %sd%{% endtrans %}</b>&nbsp
+                                    </legend>
+                                    <div>
+                                        {% if d %}
+                                            <input id='new-hd-file' name="newHD" type="file"/>
+                                            <br/>
+                                            <label for="CCFNALP" class="checkbox">
+                                                <input type="checkbox" name="ccfilename" id="CCFNALP" value="1">
+                                                {{ "mettre a jour le nom original de fichier apres substitution" | trans }}
+                                            </label>
+                                            <input type="hidden" name="prodToolsHDSubstitution_token" value="{{ app['session'].get('prodToolsHDSubstitution_token') }}">
+                                        {% else %}
+                                            <input id='new-sd-file' name="newThumb" type="file"/>
+                                            <input type="hidden" name="prodToolsThumbSubstitution_token" value="{{ app['session'].get('prodToolsThumbSubstitution_token') }}">
+                                        {% endif %}
+                                        <input type="hidden" name="subdef" value="{{ substituable|e }}"/>
+                                        <input type="hidden" name="sbas_id" value="{{ record.get_sbas_id() }}"/>
+                                        <input type="hidden" name="record_id" value="{{ record.get_record_id() }}"/>
+                                        <div class="load"></div>
+                                        <div class='resultAction'></div>
                                     </div>
-                                </form>
-                            </div>
-                        {% endfor %}
-                    {% endif %}
+                                </fieldset>
+                                <div style='text-align:right;padding-top:10px;'>
+                                    <button class="iframe_submiter btn btn-inverse">{{ "validate" | trans }}</button>
+                                    <button class="action_cancel btn btn-inverse">{{ "cancel" | trans }}</button>
+                                </div>
+                            </form>
+                        </div>
+                    {% endfor %}
                 </div>
             {% endfor %}
         {% endif %}