POs not able to close

We are at fiscal year end and the Purchasing department called that they can't close some POs

these are POs that have not been touched (no vouchers, payments etc.)

when the attempt is made to close the PO and error message appears:

"The Purchase Order may not be closed because it has not been fully Matched."

No matching has occurred because there were no Vouchers!!

Has anyone else worked around this?