Hi there,

I just found the explanation and a correct way of doing this based on my limitted understanding of accounting but I guess it's a valid solution. The explanation is mainly because in your tax definitions, both taxes uses the same invoice tax account.

First, you need to know that I was having this situation with the computation of 2 taxes. Here in Quebec there's 2 taxes (TPS and TVQ) that needs to be computed on the same base.

After setting all my products to use both TPS and TVQ by default, I needed to go in accounting->configurations->accounts and duplicate the account 121000 - Tax Received into 2 new accounts 121001 - Tax Received TPS asn 121002 - Tax Received TVQ. Then, for each tax in my accounting->configurations->taxes->taxes screen I set its corresponding account and bingo, the problem was solve.

Now, in the tax section of all my invoices, I can see 2 lines (one for each tax) that uses the same and correct base and the amounts are using the correct tax rate.

*Note: Be careful about the sequece number in both taxes definitions as it also reflects how it's rendered on your invoices.