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Currently OFbiz applies global discount on invoice level. This is not always valid for VAT depending on countries. For VAT amount for each line must be known, so discounts have to be applied per line
For instance it's OK for UK, and maybe Germany, but not in France and Italy where they should be grouped by VAT rates.

5. Reporting

In most countries there is need for monthly or in general periodic VAT reports with all sales and purchases.
The report must be splitted by rates since, most of the time, totals by rate are needed for the final (official) report.
Exemption and zero rate can be dealed as ordinary rates (see section 11). This report should allow to fill the official report in all cases.

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