On Android, Whenever I take a ticket and remove the tax, i.e. tax exempt sale, and then go to bill the customer on an invoice, the tax gets added back onto the invoice and the only way to remove the tax is to go line by line and turn the tax off (terribly inconvenient).
On iOS however, the correct behavior is exhibited, when I take a ticket and charge to an invoice the tax remains off and the invoice is correct.
This is the android version:
This is the same on a tablet or mobile POS release and Beta Release.
On iOS this is what it looks like:
