Index: lib/grade/grade_item.php
===================================================================
RCS file: /cvsroot/moodle/moodle/lib/grade/grade_item.php,v
retrieving revision 1.130.2.35
diff -u -r1.130.2.35 grade_item.php
--- lib/grade/grade_item.php	3 Feb 2010 02:22:58 -0000	1.130.2.35
+++ lib/grade/grade_item.php	30 Mar 2010 13:53:36 -0000
@@ -1446,12 +1446,6 @@
 
         // changed grade?
         if ($finalgrade !== false) {
-            if ($this->is_overridable_item()) {
-                $grade->overridden = time();
-            } else {
-                $grade->overridden = 0;
-            }
-
             $grade->finalgrade = $this->bounded_grade($finalgrade);
         }
 
@@ -1469,13 +1463,18 @@
         if (empty($grade->id)) {
             $grade->timecreated  = null;   // hack alert - date submitted - no submission yet
             $grade->timemodified = time(); // hack alert - date graded
+            if ($this->is_overridable_item()) {
+                $grade->overridden = time();
+            }
             $result = (boolean)$grade->insert($source);
 
         } else if (grade_floats_different($grade->finalgrade, $oldgrade->finalgrade)
                 or $grade->feedback       !== $oldgrade->feedback
-                or $grade->feedbackformat != $oldgrade->feedbackformat
-                or $grade->overridden     != $oldgrade->overridden) {
+                or $grade->feedbackformat != $oldgrade->feedbackformat) {
             $grade->timemodified = time(); // hack alert - date graded
+            if ($this->is_overridable_item()) {
+                $grade->overridden = time();
+            }
             $result = $grade->update($source);
         } else {
             // no grade change