diff --git a/ChangeLog b/ChangeLog
index a169a80654b..00a07efb2d1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -19,6 +19,7 @@ Fix: Paypal link were broken dur to SSL v3 closed.
 - Fix: Show sender Country on PDF docs when sender Country <> receiver Country
 - Fix: [ bug #1624 ] Use lowest buying price for margin when selling with POS
 - Fix: [ bug #1749 ] Undefined $mailchimp
+- Fix: [ bug #1731 ] Can't use quick navigation on project tasks secondary tabs
 
 ***** ChangeLog for 3.6.1 compared to 3.6.* *****
 For users:
diff --git a/htdocs/projet/tasks/contact.php b/htdocs/projet/tasks/contact.php
index f0bdce25fca..8a6ebb0a3d4 100644
--- a/htdocs/projet/tasks/contact.php
+++ b/htdocs/projet/tasks/contact.php
@@ -57,7 +57,7 @@ $projectstatic = new Project($db);
 // Add new contact
 if ($action == 'addcontact' && $user->rights->projet->creer)
 {
-	$result = $object->fetch($id);
+	$result = $object->fetch($id, $ref);
 
     if ($result > 0 && $id > 0)
     {
@@ -87,7 +87,7 @@ if ($action == 'addcontact' && $user->rights->projet->creer)
 // bascule du statut d'un contact
 if ($action == 'swapstatut' && $user->rights->projet->creer)
 {
-	if ($object->fetch($id))
+	if ($object->fetch($id, $ref))
 	{
 	    $result=$object->swapContactStatus(GETPOST('ligne'));
 	}
@@ -100,7 +100,7 @@ if ($action == 'swapstatut' && $user->rights->projet->creer)
 // Efface un contact
 if ($action == 'deleteline' && $user->rights->projet->creer)
 {
-	$object->fetch($id);
+	$object->fetch($id, $ref);
 	$result = $object->delete_contact($_GET["lineid"]);
 
 	if ($result >= 0)
@@ -152,7 +152,7 @@ $userstatic = new User($db);
 
 if ($id > 0 || ! empty($ref))
 {
-	if ($object->fetch($id) > 0)
+	if ($object->fetch($id, $ref) > 0)
 	{
 		$result=$projectstatic->fetch($object->fk_project);
 		if (! empty($projectstatic->socid)) $projectstatic->societe->fetch($projectstatic->socid);
@@ -245,7 +245,7 @@ if ($id > 0 || ! empty($ref))
 		    $object->next_prev_filter=" fk_projet in (".$projectsListId.")";
 		}
 		else $object->next_prev_filter=" fk_projet = ".$projectstatic->id;
-	    print $form->showrefnav($object,'id',$linkback,1,'rowid','ref','',$param);
+	    print $form->showrefnav($object,'ref',$linkback,1,'ref','ref','',$param);
 		print '</td></tr>';
 
 		// Label
diff --git a/htdocs/projet/tasks/document.php b/htdocs/projet/tasks/document.php
index 50763f839f7..03ca7bae452 100644
--- a/htdocs/projet/tasks/document.php
+++ b/htdocs/projet/tasks/document.php
@@ -209,7 +209,7 @@ if ($object->id > 0)
 		$object->next_prev_filter=" fk_projet in (".$projectsListId.")";
 	}
 	else $object->next_prev_filter=" fk_projet = ".$projectstatic->id;
-	print $form->showrefnav($object,'id',$linkback,1,'rowid','ref','',$param);
+	print $form->showrefnav($object,'ref',$linkback,1,'ref','ref','',$param);
 	print '</td>';
 	print '</tr>';
 
diff --git a/htdocs/projet/tasks/note.php b/htdocs/projet/tasks/note.php
index a6f8846ce0e..04e92c7c7f2 100644
--- a/htdocs/projet/tasks/note.php
+++ b/htdocs/projet/tasks/note.php
@@ -181,7 +181,7 @@ if ($object->id > 0)
 	    $object->next_prev_filter=" fk_projet in (".$projectsListId.")";
 	}
 	else $object->next_prev_filter=" fk_projet = ".$projectstatic->id;
-	print $form->showrefnav($object,'id',$linkback,1,'rowid','ref','',$param);
+	print $form->showrefnav($object,'ref',$linkback,1,'ref','ref','',$param);
 	print '</td></tr>';
 
 	// Label
diff --git a/htdocs/projet/tasks/time.php b/htdocs/projet/tasks/time.php
index 7136ffc43c5..8f72510adba 100644
--- a/htdocs/projet/tasks/time.php
+++ b/htdocs/projet/tasks/time.php
@@ -72,7 +72,7 @@ if ($action == 'addtimespent' && $user->rights->projet->creer)
 
 	if (! $error)
 	{
-		$object->fetch($id);
+		$object->fetch($id, $ref);
 
 		$object->timespent_note = $_POST["timespent_note"];
 		$object->timespent_duration = $_POST["timespent_durationhour"]*60*60;	// We store duration in seconds
@@ -109,7 +109,7 @@ if ($action == 'updateline' && ! $_POST["cancel"] && $user->rights->projet->cree
 
 	if (! $error)
 	{
-		$object->fetch($id);
+		$object->fetch($id, $ref);
 
 		$object->timespent_id = $_POST["lineid"];
 		$object->timespent_note = $_POST["timespent_note_line"];
@@ -183,7 +183,7 @@ if ($id > 0 || ! empty($ref))
 	/*
 	 * Fiche projet en mode visu
 	*/
-	if ($object->fetch($id) >= 0)
+	if ($object->fetch($id, $ref) >= 0)
 	{
 		$result=$projectstatic->fetch($object->fk_project);
 		if (! empty($projectstatic->socid)) $projectstatic->societe->fetch($projectstatic->socid);
@@ -277,7 +277,7 @@ if ($id > 0 || ! empty($ref))
 			$object->next_prev_filter=" fk_projet in (".$projectsListId.")";
 		}
 		else $object->next_prev_filter=" fk_projet = ".$projectstatic->id;
-		print $form->showrefnav($object,'id',$linkback,1,'rowid','ref','',$param);
+		print $form->showrefnav($object,'ref',$linkback,1,'ref','ref','',$param);
 		print '</td></tr>';
 
 		// Label