diff --git a/htdocs/contrat/card.php b/htdocs/contrat/card.php
index 491ead83b6e..844cd4321a4 100644
--- a/htdocs/contrat/card.php
+++ b/htdocs/contrat/card.php
@@ -1409,11 +1409,11 @@ else
 		$morehtmlref.='<div class="refidno">';
 		// Ref customer
 		$morehtmlref.=$form->editfieldkey("RefCustomer", 'ref_customer', $object->ref_customer, $object, $user->rights->contrat->creer, 'string', '', 0, 1);
-		$morehtmlref.=$form->editfieldval("RefCustomer", 'ref_customer', $object->ref_customer, $object, $user->rights->contrat->creer, 'string', '', null, null, '', 1);
+		$morehtmlref.=$form->editfieldval("RefCustomer", 'ref_customer', $object->ref_customer, $object, $user->rights->contrat->creer, 'string', '', null, null, '', 1, 'getFormatedCustomerRef');
 		// Ref supplier
 		$morehtmlref.='<br>';
 		$morehtmlref.=$form->editfieldkey("RefSupplier", 'ref_supplier', $object->ref_supplier, $object, $user->rights->contrat->creer, 'string', '', 0, 1);
-		$morehtmlref.=$form->editfieldval("RefSupplier", 'ref_supplier', $object->ref_supplier, $object, $user->rights->contrat->creer, 'string', '', null, null, '', 1);
+		$morehtmlref.=$form->editfieldval("RefSupplier", 'ref_supplier', $object->ref_supplier, $object, $user->rights->contrat->creer, 'string', '', null, null, '', 1, 'getFormatedSupplierRef');
 		// Thirdparty
 		$morehtmlref.='<br>'.$langs->trans('ThirdParty') . ' : ' . $object->thirdparty->getNomUrl(1);
 		if (empty($conf->global->MAIN_DISABLE_OTHER_LINK) && $object->thirdparty->id > 0) $morehtmlref.=' (<a href="'.DOL_URL_ROOT.'/contrat/list.php?socid='.$object->thirdparty->id.'&search_name='.urlencode($object->thirdparty->name).'">'.$langs->trans("OtherContracts").'</a>)';
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 627e67a38b7..6ffe65cc996 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -457,6 +457,46 @@ abstract class CommonObject
 		return $this->error.(is_array($this->errors)?(($this->error!=''?', ':'').join(', ',$this->errors)):'');
 	}
 
+	/**
+	 * Return customer ref for screen output.
+	 *
+	 * @param  string      $objref        Customer ref
+	 * @return string                     Customer ref formated
+	 */
+	function getFormatedCustomerRef($objref)
+	{
+	    global $hookmanager;
+
+	    $parameters=array('objref'=>$objref);
+	    $action='';
+	    $reshook = $hookmanager->executeHooks('getFormatedCustomerRef', $parameters, $this, $action); // Note that $action and $object may have been modified by some hooks
+	    if ($reshook > 0)
+	    {
+	        return $hookmanager->resArray['objref'];
+	    }
+	    return $objref.(isset($hookmanager->resArray['objref'])?$hookmanager->resArray['objref']:'');
+	}
+
+	/**
+	 * Return supplier ref for screen output.
+	 *
+	 * @param  string      $objref        Supplier ref
+	 * @return string                     Supplier ref formated
+	 */
+	function getFormatedSupplierRef($objref)
+	{
+	    global $hookmanager;
+
+	    $parameters=array('objref'=>$objref);
+	    $action='';
+	    $reshook = $hookmanager->executeHooks('getFormatedSupplierRef', $parameters, $this, $action); // Note that $action and $object may have been modified by some hooks
+	    if ($reshook > 0)
+	    {
+	        return $hookmanager->resArray['objref'];
+	    }
+	    return $objref.(isset($hookmanager->resArray['objref'])?$hookmanager->resArray['objref']:'');
+	}
+
 	/**
 	 *	Return full name (civility+' '+name+' '+lastname)
 	 *
diff --git a/htdocs/core/class/hookmanager.class.php b/htdocs/core/class/hookmanager.class.php
index 4b0ed682e49..98193f1e32e 100644
--- a/htdocs/core/class/hookmanager.class.php
+++ b/htdocs/core/class/hookmanager.class.php
@@ -33,7 +33,7 @@ class HookManager
      * @var DoliDB Database handler.
      */
     public $db;
-	
+
 	/**
 	 * @var string Error code (or message)
 	 */
@@ -168,6 +168,8 @@ class HookManager
 				'getFormMail',
 				'getIdProfUrl',
 				'getDirList',
+			    'getFormatedCustomerRef',
+			    'getFormatedSupplierRef',
 				'moveUploadedFile',
 				'moreHtmlStatus',
 				'pdf_build_address',