Index: questionlib.php
===================================================================
RCS file: /cvsroot/moodle/moodle/lib/questionlib.php,v
retrieving revision 1.231
diff -u -r1.231 questionlib.php
--- questionlib.php	12 Aug 2010 19:01:30 -0000	1.231
+++ questionlib.php	24 Aug 2010 16:01:06 -0000
@@ -878,6 +878,16 @@
     $result = $result && $DB->set_field_select('question', 'category', $newcategoryid, "parent IN ($questionids)");
 
     // TODO Deal with datasets.
+    $qtypes= array('calculated','calculatedmulti');
+    foreach($qtypes as $qtype){
+        $sql = "SELECT * FROM {question} WHERE qtype = '$qtype' AND id IN ($questionids)";
+        if( $questions = $DB->get_records_sql($sql)){
+            foreach($questions as $question) {
+                $QTYPES[$question->qtype]->move_category_datasets($question);
+            }
+        }
+    }
+    
 
     return $result;
 }