Hello Jacek Es,
Did you manage to solve this problem?
I have the same issue.
The order comes in with the correct item price (10.80), but when I generate the invoice sometimes the price on the order changes (10.81) but o the invoice is 10.80
I use an external billing program.
The Price is: 9.075630 VAT excl. and 10.80 VAT incl.
My rounding option are:
- Round up away from zero, when it is half way there.
- Round on each item