--- /availability/condition/grouping/classes/condition.php	2017-08-21 17:21:34.578137109 +0300
+++ /availability/condition/grouping/classes/condition.php	2017-07-24 17:15:27.125988817 +0300
@@ -146,6 +146,19 @@
                     array('context' => $context));
         }
 
+        //<OUIL #6403
+        if(\has_capability('moodle/course:managegroups', $context)){
+        $name = \html_writer::link(new \moodle_url('/group/overview.php',
+        					array('id' => $course->id,
+        					      'group'     => 0,
+        					      'grouping'  => $groupingid)
+        					),
+        			$name,
+        			array('target'=>'_blank')
+        			);
+        }
+        //>
+
         return get_string($not ? 'requires_notgrouping' : 'requires_grouping',
                 'availability_grouping', $name);
     }