If I use Additional Reporting Currency then I must have the option insert „Additional-currency amount“ before posting Purchase Invoice in Purchase Invoice statistics – Lines. Please, add field Additional-Currency Amount, Additional-Currency Base to VAT amount Line. Program will fill in Additional-Currency Amount by currency Exchange rates. And then user adjust „Additional-Currency Amount“. Program will calculate Add.-Curr. VAT Difference. User must have possibility adjust Additional-Currency Amount because they must have right amount by document from vendor. This is necessary due to tax laws.

The result will be the correct filling of the VAT entry (field – „Additional-Currency Amount“ and field „Add.-Curr. VAT Difference“.)