diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index 28869e76fca..337b0423826 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -2322,16 +2322,16 @@ class Commande extends CommonObject
             dol_syslog("CustomerOrder::delete error", LOG_ERR);
             $err++;
         }
-
+ 
         // On efface le repertoire de pdf provisoire
         $comref = dol_sanitizeFileName($this->ref);
         if ($conf->commande->dir_output)
         {
             $dir = $conf->commande->dir_output . "/" . $comref ;
             $file = $conf->commande->dir_output . "/" . $comref . "/" . $comref . ".pdf";
-            if (file_exists($file))
+            if (file_exists($file))	// We must delete all files before deleting directory
             {
-                commande_delete_preview($this->db, $this->id, $this->ref);
+                dol_delete_preview($object);
 
                 if (!dol_delete_file($file))
                 {
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index f22692f6da0..cf17e5dc564 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -1609,7 +1609,7 @@ abstract class CommonObject
         }
         else return 0;
     }
-
+    
 
     // --------------------
     // TODO: All functions here must be redesigned and moved as they are not business functions but output functions
@@ -1619,6 +1619,7 @@ abstract class CommonObject
 	/**
 	 *
 	 * Enter description here ...
+	 * 
 	 * @param unknown_type $objectid
 	 * @param unknown_type $objecttype
 	 * @param unknown_type $withpicto
diff --git a/htdocs/includes/modules/commande/modules_commande.php b/htdocs/includes/modules/commande/modules_commande.php
index dfd948bd4d8..65a7344ba09 100644
--- a/htdocs/includes/modules/commande/modules_commande.php
+++ b/htdocs/includes/modules/commande/modules_commande.php
@@ -201,8 +201,10 @@ function commande_pdf_create($db, $object, $modele, $outputlangs, $hidedetails=0
 		if ($obj->write_file($object, $outputlangs, $srctemplatepath, $hidedetails, $hidedesc, $hideref, $hookmanager) > 0)
 		{
 			$outputlangs->charset_output=$sav_charset_output;
-			// on supprime l'image correspondant au preview
-			commande_delete_preview($db, $object->id);
+
+			// we delete preview files
+        	require_once(DOL_DOCUMENT_ROOT."/lib/files.lib.php");
+			dol_delete_preview($object);
 
 			// Appel des triggers
 			include_once(DOL_DOCUMENT_ROOT . "/core/class/interfaces.class.php");
@@ -234,58 +236,4 @@ function commande_pdf_create($db, $object, $modele, $outputlangs, $hidedetails=0
 		return 0;
 	}
 }
-
-/**
- *  Supprime l'image de previsualitation, pour le cas de regeneration de commande
- *  @param	    db  		data base object
- *  @param	    commandeid	id de la commande a effacer
- *  @param      commanderef reference de la commande si besoin
- */
-function commande_delete_preview($db, $commandeid, $commanderef='')
-{
-	global $langs,$conf;
-    require_once(DOL_DOCUMENT_ROOT."/lib/files.lib.php");
-
-	if (!$commanderef)
-	{
-		$com = new Commande($db);
-		$com->fetch($commandeid);
-		$commanderef = $com->ref;
-	}
-
-	if ($conf->commande->dir_output)
-	{
-		$comref = dol_sanitizeFileName($commanderef);
-		$dir = $conf->commande->dir_output . "/" . $comref ;
-		$file = $dir . "/" . $comref . ".pdf.png";
-		$multiple = $file . ".";
-
-		if ( file_exists( $file ) && is_writable( $file ) )
-		{
-			if ( ! dol_delete_file($file,1) )
-			{
-				$this->error=$langs->trans("ErrorFailedToOpenFile",$file);
-				return 0;
-			}
-		}
-		else
-		{
-			for ($i = 0; $i < 20; $i++)
-			{
-				$preview = $multiple.$i;
-
-				if ( file_exists( $preview ) && is_writable( $preview ) )
-				{
-					if ( ! dol_delete_file($preview,1) )
-					{
-						$this->error=$langs->trans("ErrorFailedToOpenFile",$preview);
-						return 0;
-					}
-				}
-			}
-		}
-	}
-
-	return 1;
-}
 ?>
diff --git a/htdocs/lib/files.lib.php b/htdocs/lib/files.lib.php
index d94969be227..bda036d44b7 100644
--- a/htdocs/lib/files.lib.php
+++ b/htdocs/lib/files.lib.php
@@ -605,6 +605,7 @@ function dol_move_uploaded_file($src_file, $dest_file, $allowoverwrite, $disable
 
 /**
  *  Remove a file or several files with a mask
+ *  
  *  @param      file            File to delete or mask of file to delete
  *  @param      disableglob     Disable usage of glob like *
  *  @param      nophperrors     Disable all PHP output errors
@@ -658,6 +659,7 @@ function dol_delete_file($file,$disableglob=0,$nophperrors=0,$notrigger=0,$trigg
 /**
  *  Remove a directory (not recursive, so content must be empty).
  *  If directory is not empty, return false
+ *  
  *  @param      dir             Directory to delete
  *  @param      nophperrors     Disable all PHP output errors
  *  @return     boolean         True if success, false if error
@@ -712,6 +714,54 @@ function dol_delete_dir_recursive($dir,$count=0,$nophperrors=0)
     return $count;
 }
 
+    
+/**
+ *  Delete all preview files linked to object instance
+ *  
+ *  @param	Object	$object		Object to clean
+ *  @return	int					0 if error, 1 if OK
+ */
+function dol_delete_preview($object)
+{
+	global $langs,$conf;
+    require_once(DOL_DOCUMENT_ROOT."/lib/files.lib.php");
+
+    if ($object->element == 'commande') $dir = $conf->commande->dir_output;
+    if (empty($dir)) return 'ErrorObjectNoSupportedByFunction';
+    
+	$refsan = dol_sanitizeFileName($object->ref);
+	$dir = $dir . "/" . $refsan ;
+	$file = $dir . "/" . $refsan . ".pdf.png";
+	$multiple = $file . ".";
+
+	if (file_exists($file) && is_writable($file))
+	{
+		if ( ! dol_delete_file($file,1) )
+		{
+			$this->error=$langs->trans("ErrorFailedToOpenFile",$file);
+			return 0;
+		}
+	}
+	else
+	{
+		for ($i = 0; $i < 20; $i++)
+		{
+			$preview = $multiple.$i;
+
+			if (file_exists($preview) && is_writable($preview))
+			{
+				if ( ! dol_delete_file($preview,1) )
+				{
+					$this->error=$langs->trans("ErrorFailedToOpenFile",$preview);
+					return 0;
+				}
+			}
+		}
+	}
+
+	return 1;
+}
+
 
 /**
  * Get and save an upload file (for example after submitting a new file a mail form).