Project Unprocessed Transactions from Payables in Closed Periods Will Not Import; How to Sweep?

SOS! :)

I have a customer who has an Unprocessed Projects Transaction with a source of Payables. The Payables Invoice Accounting Date is 12/23; the Invoice Transaction Date is 6/6/23. The transaction is stuck in the interface (Manage Unprocessed Costs), with options for import restricted to opening the previous project periods.

So here is the question. How can we sweep the Unprocessed Project Transaction to the latest open period? We ran the Project sweep, but it did not pick up anything (because the transaction has not been imported to Projects, presumably).