Bed found in USD in vendor excise invoice?

Hi Experts,

I am facing one problem related to Vendor excise invoice, At the time of generating vendor excise invoice USD amount in PO not get converted in INR for BED. BED is showing in USD, I have checked PO, MIRO, all is found ok, the currency is set to USD & Exch.Rate also set. What can i do to get BED in INR? Please suggest.