Index: temp_moodle_dev/moodle/mod/glossary/rate.php
===================================================================
diff -u -r5251d2a62e0e78377219456d6bba613eb2d1fd26 -raca9f00eec05f594be36b6397b9c363742db6022
--- temp_moodle_dev/moodle/mod/glossary/rate.php	(.../rate.php)	(revision 5251d2a62e0e78377219456d6bba613eb2d1fd26)
+++ temp_moodle_dev/moodle/mod/glossary/rate.php	(.../rate.php)	(revision aca9f00eec05f594be36b6397b9c363742db6022)
@@ -45,6 +45,10 @@
     }
 
     if ($data = data_submitted()) {    // form submitted
+
+    /// Calculate scale values
+        $scale_values = make_grades_menu($glossary->scale);
+
         foreach ((array)$data as $entryid => $rating) {
             if (!is_numeric($entryid)) {
                 continue;
@@ -69,6 +73,11 @@
                 continue;
             }
 
+        /// Check rate is valid for that glossary scale values
+            if (!array_key_exists($rating, $scale_values) && $rating != -999) {
+                print_error('invalidrate', 'glossary', '', $rating);
+            }
+
             if ($oldrating = get_record("glossary_ratings", "userid", $USER->id, "entryid", $entry->id)) {
                 //Check if we must delete the rate
                 if ($rating == -999) {