Dear Sir,
As given in FA Wikki, i have assigned the values as per my need, but it's not working fine, it gives some error.
i.e. when creating sales order it is giving 12% VAT that is right but when creating purchase order it also gives 12.6 % of VAT, which is wrong. it will be 4% & 1% of VAT.
I have given following setting for my needs for tax association with sales & purchase
Tax types are
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Description    Default Rate (%)  Sales GL Account           Purchasing GL Account    
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VAT                4.0                      Purchases of materials    Purchases of materials        
Additional VAT    1.0                      Purchase price Variance  Purchase price Variance        
VAT                    12.6                      Sales                             Sales        
Tax groups are -
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Description    Shipping Tax    
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VAT                  No        
Tax Exempt    No    
Item tax are -
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Name    Tax exempt    
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Regular    No        
Preferenced Goods    No    
In regular Tax, i have selected VAT (12.6%) & in preferrenced tax i have give for VAT(4%) & Additional VAT (1%). So, sir please solve this problem .... waiting for ur reply ....
regards,
Sumit Singh 
(India)