Exchange Rate for Excise Invoice (J1IIN)

Hi Experts,

which field the exchange rate is considering to calculate the excise duty for export excise invoice?

We are maintaining Exchange rate in OB08 with Exchange rate type--M (Standard translation at average rate) on daily basic as per Bank Exchange rate.

But in excise invoice we want to calculate an exchange rate from customs which is maintained in different Exchange Rate Type (it will be changed on monthly basic).

We need to copy same exchange rate from billing to Excise Invoice which is not 'M' maintained in Company code setting in CIN config.

Please suggest,