diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index d0f621fd09b..6b8e3469d34 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -3561,18 +3561,20 @@ class Form
      *    To add a particular filter on select, you must set $object->next_prev_filter to SQL criteria.
      *
      *    @param	Object	$object			Object to show
-     *    @param    int		$paramid   		Name of parameter to use to name the id into the URL link
-     *    @param    string	$morehtml  		More html content to output just before the nav bar
+     *    @param   string	$paramid   		Name of parameter to use to name the id into the URL link
+     *    @param   string	$morehtml  		More html content to output just before the nav bar
      *    @param	int		$shownav	  	Show Condition (navigation is shown if value is 1)
-     *    @param    int		$fieldid   		Nom du champ en base a utiliser pour select next et previous
-     *    @param    string	$fieldref   	Nom du champ objet ref (object->ref) a utiliser pour select next et previous
-     *    @param    string	$morehtmlref  	Code html supplementaire a afficher apres ref
-     *    @param    string	$moreparam  	More param to add in nav link url.
-     * 	  @return   tring    				Portion HTML avec ref + boutons nav
+     *    @param   string	$fieldid   		Nom du champ en base a utiliser pour select next et previous
+     *    @param   string	$fieldref   	Nom du champ objet ref (object->ref) a utiliser pour select next et previous
+     *    @param   string	$morehtmlref  	Code html supplementaire a afficher apres ref
+     *    @param   string	$moreparam  	More param to add in nav link url.
+     * 	  @return  tring    				Portion HTML avec ref + boutons nav
      */
     function showrefnav($object,$paramid,$morehtml='',$shownav=1,$fieldid='rowid',$fieldref='ref',$morehtmlref='',$moreparam='')
     {
         $ret='';
+        if (empty($fieldid))  $fieldid='rowid';
+        if (empty($fieldref)) $fieldref='ref';
 
         //print "paramid=$paramid,morehtml=$morehtml,shownav=$shownav,$fieldid,$fieldref,$morehtmlref,$moreparam";
         $object->load_previous_next_ref((isset($object->next_prev_filter)?$object->next_prev_filter:''),$fieldid);