Ideas

At present the Extra VAT calculation logic is correct but the apportionment logic of discount and extra vat is wrong. Understand by the following logic:

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Buy 1 Get 1 Free , pay VAT extra.
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A126 2999
A125 1999

IN THIS IF 1999 IS FREE THAN THE DISCOUNT AMOUNT SHOULD GET APPORTIONED IN BOTH THE ITEMS TO REDUCE THE APPLICABLE RSP VALUE AND SHOW CORRECT EXTRA VAT CALCULATION.
RIGHT NOW THE DISCOUNT IS GETTING POPULATED ON FREE ITEM AND EXTRA VAT ON BUY ITEM. THUS DUE TO THIS THE VALUE OF BUY ITEM IS MORE THAN THEN RSP.

IF THIS IS NOT A EXTRA VAT PROMOTION VALUE APPORTIONMENT SHOULD BE SAME AS IT IS.