1. Create a gift query
     
  2. On the Criteria tab, select:

    Adjustments, Gift Adjustment Funds, Fund ID equals [the name of the fund on the adjustment

    OR

    Adjustments, Gift Adjustment Previous Funds, Fund ID equals [the name of the fund on the adjustment
     
  3. Run the Unpost Gifts plug-in based on the query created in step 1
Note: This will also unpost the original gift.  Please mark the original gifts back to posted as needed.