Q. PO is not exporting or is staying on the grid
A.
if that PO has no actual products in it: its only line has an empty ItemID because it's only for freight. What we can recommend is that they switch to exporting as service purchases and export only that one purchase (she needs to untick exporting sales and expenses to make sure she doesn't inadvertently export those). Once exported, she can switch back to the item purchases option