The report indicate that Purchase Orders were received but are not billed yet
This is what i was thinking.
Please confirm my understanding
Normally this report should not return any data if all POs are matched against Invoices? The report only returns POs not matched with invoices.
Between Receiving and Invoicing, this report should print accrual account with a net balance not equal to zero in a summarized (so, this include, for example, Quantities differ between receipts and invoices, unit price differences, ... POs invoiced but not received)
Now, for the case you reported, and assuming that full matching (billing) was occurred run the Accrual Reconciliation Load Run again to clear out POs from report.