Index: course/lib.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- course/lib.php	(revision bbb12aa0932f2a7fad343c0ebb3329b1459966d4)
+++ course/lib.php	(revision )
@@ -2411,14 +2411,14 @@
     }
 
     // Check we don't have a duplicate shortname.
-    if (!empty($data->shortname) && $oldcourse->shortname != $data->shortname) {
+    if (!empty($data->shortname) && textlib::strtolower($oldcourse->shortname) != textlib::strtolower($data->shortname)) {
         if ($DB->record_exists('course', array('shortname' => $data->shortname))) {
             throw new moodle_exception('shortnametaken', '', '', $data->shortname);
         }
     }
 
     // Check we don't have a duplicate idnumber.
-    if (!empty($data->idnumber) && $oldcourse->idnumber != $data->idnumber) {
+    if (!empty($data->idnumber) && textlib::strtolower($oldcourse->idnumber) != textlib::strtolower($data->idnumber)) {
         if ($DB->record_exists('course', array('idnumber' => $data->idnumber))) {
             throw new moodle_exception('idnumbertaken', 'error');
         }