I find it really frustating when doing invoices that on most occasions when there are multiple quantities, the system addss the total wrongly. For example 2 x £2.50 on kashflow is £4.99. and 2 x £2.30 is £4.61 etc etc.
You can override the total manually but it's time consuming when you need to go back and adjust most of the totals to arrive at the correct invoice total, which in my case needs to match a Paypal or retail order.
I can't imagine I am unique with this problem?