PO project related distribution line updates

11.5.10

We are going through a reorg and all the department numbers are changing for the business.  However, we have Purchase Orders that have been issued that are project related and use the Project Owning Org to derive the department number for accounting via Workflow Account Generator.  Even after our change, the accounting will not be updated when Accounts Payable matches an invoice to the Purchase Order.  Therefore, the transaction will fail when Accounts Payable tries to send it to the General Ledger because the old departments will be closed.

Is there a way to get the accounting to recalculate without updating every distribution line project, task and expenditure type?