@Martin_Anonym, I have tested and found 4 issues:
first: it is really good we have 2 options for VAT tax, this is a valuable feature!
there are some small calculation problems, that occur mainly because of this separation.
Invoiceplane has item tax and invoice tax.
item tax can be used when we have 2 or more VAT tax rates (eg. in NL 9% and 21%)
we can use the item tax to add separate tax rates: item tax
product 1 qty=1 price=100 discount=10% item tax=9% total 90
product 2 qty=1 price=100 discount=€50 item tax=21% total 50
item tax 9%= 8.10
item tax 21%= 10.50
discount= 20% PROBLEM!: now invoice tax must change accordingly,
but which VAT rate?
This is important:
therefore we must disable discount and invoice tax in total column when using item tax.
and disable item tax when using invoice tax (1 VAT tax rate)
This applies to VAT tax for all countries and tax laws:
there cannot be another tax.
So before tax, after tax, invoice tax, item tax is confusing as hell, but its basically the same.
therefore we must use on or the other; disabling the fields would be a solution.
see screenshot issue_1.png
in product rows:
when adding only item tax and discount % ;it is calculated correctly, when adding discount amount it is not calculated correctly.
see screenshot issue_2.png
In totals column:
- when adding discount % or amount from totals column, the invoice tax is NOT changed.
But it should. Discount is on price not on VAT.
VAT plays never a role in any discount or price, its always applied after, for your governments wallet.
see screenshots issue_3.png, issue_3-1.png
in totals column:
when adding ONLY invoice tax and discount % it is calculated correctly, discount amount is NOT calculated correctly.
when there is no invoice tax, both discount % and discount amount are not calculated at all.
see screenshot issue_4.png, issue_4-1.png