Clearing PPV balance

We have balance in PPV due to differences in Standard Cost & PO and further all non-recoverable costs in Bill of Entry are charged/added to PPV account

Please advise how the balance in PPV will be cleared automatically. We want to move balance in PPV to item cost/cost of sales and don't see entries in mtl_transactions_interface. Please advise as what is the expected standard functionality to clear PPV balance and how the non recoverable cost in BOE application to receipt has to be dealt. We are using standard costing method.