REM ....  (I used the demo database to avoid any ambiguities), and sorry for not attaching images cuz of karma!!!


I Created two sales taxes, one "Tax 10%" and "Tax 1%", and assigned them two different general accounts "265000 Use Tax Payable" and "255000 Sales Tax Payable".
When I created a customer invoice including BOTH taxes (any individual tax is working fine), i got a zero transaction in its journal, among other four RIGHT journal tansactions.
Can any one try to explain why?

SAJ/2014/0001 / China Export 120010 Account Receivable 05/10/2014 2331.00 0.00 0.00 0.00 Balanced
SAJ/2014/0001 Tax 1.00% China Export 265000 Use Tax Payable 0.00 21.00 0.00 Tax Received at default rate 21.00 Balanced
SAJ/2014/0001 Tax 10.00% China Export 255000 Sales Tax Payable 0.00 210.00 0.00 Tax Received at default rate 210.00 Balanced
SAJ/2014/0001 [CPUi5] Processor Core i5 2.70 Ghz China Export X2001 Product Sales - (test) 0.00 0.00 0.00 Taxable Sales at default rate 2100.00 Balanced
SAJ/2014/0001 [CPUi5] Processor Core i5 2.70 Ghz China Export X2001 Product Sales - (test) 0.00 2100.00 0.00 Taxable Sales at default rate 2100.00 Balanced