Hi Subha,
In dealer purchase, PO price include with excise amount. At the time of excise invoice posting, the excise base value is defaulted as the PO price and the excise duties are zero. The excise base is changed such that the sum of the excise base value and the excise duties remain the same as the PO price. The excise base is reduced by the excise duty value and the differential amount is split amongst the relevant excise duty components. At the time of invoice posting, you change the base value, same as in excise invoice.
Regards,
Mukthar
P.S: If your issue is resolved, please close it.