History for UndoMethod

??changed:
-
<pre>
def undo(self, transaction_id):
    self._lock_acquire()
    try:
        transaction_id = base64.decodestring(transaction_id+"\n")
        if not TransactionExists (transaction_id):
            raise !UndoError, "Invalid Undo Transaction Id"
        if TransactionIsNotUndoable (transaction_id):
            raise !UndoError, "Non-Undoable Transaction"
        serial = self._serial
        MakeDummyUndoRecords (serial, transaction_id)
        UndoPopulatedRecords (serial, transaction_id)
        UndoUnpopulatedRecords (serial, transaction_id)
        ClearUndoStatus (transaction_id)    
        oids = GetCurrentOids (serial)
        return oids
    finally:
        self._lock_release()
</pre>