diff --git a/htdocs/product/agenda.php b/htdocs/product/agenda.php
index 9eee66664d9..5ef9defc1d4 100644
--- a/htdocs/product/agenda.php
+++ b/htdocs/product/agenda.php
@@ -159,7 +159,7 @@ if ($id > 0 || $ref)
     if ((! empty($objproduct->id) || ! empty($objcon->id)) && $permok)
     {
         //$out.='<a href="'.DOL_URL_ROOT.'/comm/action/card.php?action=create';
-        if (get_class($objproduct) == 'Product') $out.='&amp;prodid='.$objproduct->id;
+        if (get_class($objproduct) == 'Product') $out.='&amp;prodid='.$objproduct->id.'&origin=product&originid='.$id;
         $out.=(! empty($objcon->id)?'&amp;contactid='.$objcon->id:'').'&amp;backtopage=1&amp;percentage=-1';
     	//$out.=$langs->trans("AddAnAction").' ';
     	//$out.=img_picto($langs->trans("AddAnAction"),'filenew');