diff --git a/htdocs/expensereport/class/expensereport.class.php b/htdocs/expensereport/class/expensereport.class.php
index 0041974d4e9..bffe8d146d5 100644
--- a/htdocs/expensereport/class/expensereport.class.php
+++ b/htdocs/expensereport/class/expensereport.class.php
@@ -1132,17 +1132,51 @@ class ExpenseReport extends CommonObject
         $resql=$this->db->query($sql);
         if ($resql)
         {
-			if (!$notrigger)
+			if (! $error && ! $notrigger)
 			{
 				// Call trigger
 				$result=$this->call_trigger('EXPENSE_REPORT_VALIDATE', $fuser);
-
 				if ($result < 0) {
 					$error++;
 				}
 				// End call triggers
 			}
 
+			if (! $error)
+			{
+				$this->oldref = $this->ref;
+
+				// Rename directory if dir was a temporary ref
+				if (preg_match('/^[\(]?PROV/i', $this->ref))
+				{
+					// On renomme repertoire ($this->ref = ancienne ref, $num = nouvelle ref)
+					// in order not to lose the attachments
+					$oldref = dol_sanitizeFileName($this->ref);
+					$newref = dol_sanitizeFileName($num);
+					$dirsource = $conf->expensereport->dir_output.'/'.$oldref;
+					$dirdest = $conf->expensereport->dir_output.'/'.$newref;
+					if (file_exists($dirsource))
+					{
+						dol_syslog(get_class($this)."::setValidate() rename dir ".$dirsource." into ".$dirdest);
+
+						if (@rename($dirsource, $dirdest))
+						{
+							dol_syslog("Rename ok");
+							// Rename docs starting with $oldref with $newref
+							$listoffiles=dol_dir_list($conf->expensereport->dir_output.'/'.$newref, 'files', 1, '^'.preg_quote($oldref, '/'));
+							foreach($listoffiles as $fileentry)
+							{
+								$dirsource=$fileentry['name'];
+								$dirdest=preg_replace('/^'.preg_quote($oldref, '/').'/', $newref, $dirsource);
+								$dirsource=$fileentry['path'].'/'.$dirsource;
+								$dirdest=$fileentry['path'].'/'.$dirdest;
+								@rename($dirsource, $dirdest);
+							}
+						}
+					}
+				}
+			}
+
 			if (! $error)
 			{
 			    $this->oldref = $this->ref;