Can I import PO Invoice Headers with no lines in the Payables Open Interface?

Hello,

We would like to populate Invoice Headers containing a PO number in the Payables Open Interface and then manually match the lines in the invoice workbench. However, if we enter a header for a PO invoice (with a PO number populated) it is rejected in the Payables open interace as it is expecting lines and doesn't get any. Is there any way to do this?

We are able to import headers with no PO number, but that is not the desired functionality.

Thanks,

Abigail