Can't import sales with discount

I've been trying to import sales which have a discount on them without success, usually getting either

Error -25 Invalid amount

or

Error -4344 An unbalanced transaction may not be recorded 

I thought perhaps I should export a transaction and try and model my import data on that, so I exported this simple dummy transaction:

{}
Invoice No.	Co./Last Name	Date	Shipping Date	Inclusive	Item Number	Description	Quantity	Price	Total	Tax Amount	Tax Code	Discount
9999	Credit Card Sales	2/07/2020	2/07/2020	X	59	2016 Pinot Noir 	1.000000	$10.0000	$9.00	$.90	GST	10%

To my surprise, I couldn't even re-import this transaction, getting an Error 25 again:

Summary of errors
Error -25: Invalid amount.

-25	9999	29	2/07/2020	2/07/2020	X	16	2016 Pinot Noir 	1.000000	10.0000	9.0000	0.9000	1	10.0000

Can someone please explain what I am doing wrong?

I'm running AccountRight 2020.2.2