Hi Daniele,
1. Selling > Sales Taxes and Charge Master > EU VAT
2. Selling > Item > Windmill A Series - see item tax section
3. Selling > Item > Windmill C Series - see item tax section
4. Accounts > Sales Invoice > INV00091
EU VAT is the tax template. It has both type of taxes defined, but with rates as 0. The rates will be set per Item.
Both Items have different taxes defined for them, one as 10% and other as 21%
In Sales Invoice, the items and taxes are selected, and the tax is applied per item.
I think this example should clarify things.
Thanks,
Anand.