diff --git a/htdocs/core/class/html.formfile.class.php b/htdocs/core/class/html.formfile.class.php
index 27a1ac03af4..a29b4d53ddf 100644
--- a/htdocs/core/class/html.formfile.class.php
+++ b/htdocs/core/class/html.formfile.class.php
@@ -774,7 +774,7 @@ class FormFile
         print '<table width="100%" class="nobordernopadding">';
         print '<tr class="liste_titre">';
         $sortref="fullname";
-        if ($modulepart == 'invoice_supplier') $sortref='';    // No sort for supplier invoices as path name is not
+        if ($modulepart == 'invoice_supplier') $sortref='level1name';
         print_liste_field_titre($langs->trans("Ref"),$url,$sortref,"",$param,'align="left"',$sortfield,$sortorder);
         print_liste_field_titre($langs->trans("Documents2"),$url,"name","",$param,'align="left"',$sortfield,$sortorder);
         print_liste_field_titre($langs->trans("Size"),$url,"size","",$param,'align="right"',$sortfield,$sortorder);
diff --git a/htdocs/core/lib/files.lib.php b/htdocs/core/lib/files.lib.php
index e76705a1690..3e726a67c60 100644
--- a/htdocs/core/lib/files.lib.php
+++ b/htdocs/core/lib/files.lib.php
@@ -135,8 +135,11 @@ function dol_dir_list($path, $types="all", $recursive=0, $filter="", $excludefil
 
 							if (! $filter || preg_match('/'.$filter.'/i',$file))	// We do not search key $filter into $path, only into $file
 							{
+								preg_match('/([^\/]+)\/[^\/]+$/',$path.'/'.$file,$reg);
+								$level1name=(isset($reg[1])?$reg[1]:'');
 								$file_list[] = array(
 										"name" => $file,
+										"level1name" => $level1name,
 										"fullname" => $path.'/'.$file,
 										"date" => $filedate,
 										"size" => $filesize,
@@ -159,8 +162,11 @@ function dol_dir_list($path, $types="all", $recursive=0, $filter="", $excludefil
 
 						if (! $filter || preg_match('/'.$filter.'/i',$file))	// We do not search key $filter into $path, only into $file
 						{
+							preg_match('/([^\/]+)\/[^\/]+$/',$path.'/'.$file,$reg);
+							$level1name=(isset($reg[1])?$reg[1]:'');
 							$file_list[] = array(
 									"name" => $file,
+									"level1name" => $level1name,
 									"fullname" => $path.'/'.$file,
 									"date" => $filedate,
 									"size" => $filesize,