Hi Nick,
If you do not allow negative quantity, and you have a Qty Shipped value greater than what is on hand, you will receive an error:
'There is insufficient quantity for item XXX at location YY on line Z.'
Importing will halt immediately.
If Qty shipped is not imported or is zero, then the order will be imported with no errors. And if the Company Profile Option to 'Calculate Backorder' is enabled, the Qty Ordered value will be copied to Qty Backordered.
Your suggestion is to allow importing a non-zero Qty Shipped and if there is enough on hand then to allow it, and if not then to revert all qty to be backordered instead of shipped. Is that correct? Suggestion noted.
As for tax statuses, your Tax Table setup will determine what the correct value is. Every company can have a different tax table, so you need to look at your setup to see the tax rates associated with the statuses (customer and item) and pick the one that works. Or if none of them are correct, you will need to edit the tax table to set up the correct rates.
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Regards,
Softrak Tech Support