Exchange Rate Type on PO is not carried over from requisition when PO is auto created

When a requisition is created via smart forms an exchange rate type is selected by the user. After the requisition is approved it is automatically converted into an approved purchase order. However, we can see that the exchange rate type on the PO is getting picked up as 'Corporate' and not the one the user selected on the requisition. The expectation is that PO should use the exchange rate type selected by the user instead of overriding this. This functionality works as expected in EBS R12 bit not in fusion. Any pointers on solution or this is product limitation that