Fix purchase order import when no items are tagged or batch updates fail

When you import a purchase order containing items your store has never carried before, the PO Number dropdown will now correctly display that order so you can select and price it.

If database errors occur during purchase order import, they will no longer prevent other valid purchase orders from appearing in the PO Number dropdown.

Items added from the Do it Best catalog during purchase order import will now use the correct pricing for your store's RSC, preventing incorrect costs from appearing.

You'll now see clearer messages explaining why a purchase order might not appear in the PO Number dropdown, such as when all items are missing from both your data and the vendor catalog.