Variance linked to AAI 4330 instead of PO expense account

I have several non-stock items that I would like to setup so Voucher & Match PO/Receipt records the variance to the expense account on the PO, if need be.  I ran some tests in our test environment and keep getting the AAI 4330 error, but it shouldn't even be trying to go there.  I tried two different test items, one with Line Type B and one with Line Type N; both line types have a B Inventory Interface, both items have Stocking Type N, and both items have their own GL Class (different then the GL Offset setup for the line types;