Refinement to searching for parent course generations.

application/modules/courses/models/CourseModel.php

@@ -265,6 +265,7 @@ class Courses_CourseModel extends Unl_Model
         $select = new Zend_Db_Select($db);
         $select->from(array('g' => 'creqCourseGenerations'), array('request'));
         $select->join(array('p' => 'creqCourseGenerations'), 'g.parent = p.courseGenerationId', array('courseGenerationId'));
+        $select->where('p.request != g.request OR p.request IS NULL');
         $select->where('p.type = ?', 'official');
         if (Unl_Util::isArray($request)) {
             $select->where('g.request IN(?)', $requestId);