What's the use of the tax1, tax2 and tax3 columns

[Guido1982]

In this case the three tax columns for every inventoryline would be correct yes. The weird thing is: I've tried three different installs, one of which being the coreBOS demo. I checked the three boxes (like in your TaxCalculations.png file), checked an individual service, no tax fields (check attached file). Also, creating a new SalesOrder, tax only shows all three when I set it to 'group' and click the 'tax' link for the entire SO (attached file), not when I set the tax to 'individual' (attached file 'noTaxForProductOnSo'), because I can't set the tax for that product. I know this is possible, and in one install I can set the tax for products (one, not three even though I activated them).

I feel like I'm missing something really simple here, just don't know what.