This is what we asked for here also:
www.open-tools.net/forum/shipping-by-rul...no-shipping-tax.html
The problem is that this was not part of VM until we asked for it (and payed btw) it will be added in next release of VM 2.024a.
Actually only tax per product was applied but not payment fee or shipping.
However you are setting an scenario where it applies the highest rate. We could do that, but the best option at least for Spain and Germany and many other European countries is to apply and average tax which is what VM will do.
Although I won't mind the plugin applying the highest tax between 2, that would be legally correct too, however I think the average is the correct way to do it.
This was developed following the German law which is similar to the spanish one for this case.
Please Reinhold tell us something although I guess you can't do much until version A is released.
I have the advanced plugin but currently it does not apply any tax when it faces 2 different taxes in the same order.
Regards