diff --git a/htdocs/core/actions_massactions.inc.php b/htdocs/core/actions_massactions.inc.php
index 77fbea3c36a..abcdd690d5c 100644
--- a/htdocs/core/actions_massactions.inc.php
+++ b/htdocs/core/actions_massactions.inc.php
@@ -3,7 +3,7 @@
  * Copyright (C) 2018	   Nicolas ZABOURI	<info@inovea-conseil.com>
  * Copyright (C) 2018 	   Juanjo Menent  <jmenent@2byte.es>
  * Copyright (C) 2019 	   Ferran Marcet  <fmarcet@2byte.es>
- * Copyright (C) 2019       Frédéric France         <frederic.france@netlogic.fr>
+ * Copyright (C) 2019-2021  Frédéric France         <frederic.france@netlogic.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -1167,7 +1167,38 @@ if (!$error && $massaction == 'validate' && $permissiontoadd)
 					$error++;
 					break;
 				}
-				else $nbok++;
+				else {
+					// validate() rename pdf but do not regenerate
+					// Define output language
+					if (empty($conf->global->MAIN_DISABLE_PDF_AUTOUPDATE)) {
+						$outputlangs = $langs;
+						$newlang = '';
+						if ($conf->global->MAIN_MULTILANGS && empty($newlang) && GETPOST('lang_id', 'aZ09')) {
+							$newlang = GETPOST('lang_id', 'aZ09');
+						}
+						if ($conf->global->MAIN_MULTILANGS && empty($newlang)) {
+							$newlang = $objecttmp->thirdparty->default_lang;
+						}
+						if (!empty($newlang)) {
+							$outputlangs = new Translate("", $conf);
+							$outputlangs->setDefaultLang($newlang);
+							$outputlangs->load('products');
+						}
+						$model = $objecttmp->model_pdf;
+						$ret = $objecttmp->fetch($objecttmp->id); // Reload to get new records
+						// To be sure vars is defined
+						$hidedetails = !empty($hidedetails) ? $hidedetails : 0;
+						$hidedesc = !empty($hidedesc) ? $hidedesc : 0;
+						$hideref = !empty($hideref) ? $hideref : 0;
+						$moreparams = !empty($moreparams) ? $moreparams : null;
+
+						$result = $objecttmp->generateDocument($model, $outputlangs, $hidedetails, $hidedesc, $hideref);
+						if ($result < 0) {
+							setEventMessages($objecttmp->error, $objecttmp->errors, 'errors');
+						}
+					}
+					$nbok++;
+				}
 			}
 			else
 			{