AP Deferred Expense - Amortization on functional only

I setup deferred expense in AP module and run amortization each month.
I realized that in AP are recorded with foreign currency but amortization is done only on functional currency.
Is this as designed? How can I amortize in both source currency and functional currency?

Hi, is this just for reporting on the exchange rate differences or you want to value it differently. E.g. assets valued differently to the main book?

I feel like the source amount should be slowly drawn down at the end of amortization period. but the transaction currency increases every time deferred expenses are setup (by utilizing Transaction Currency filter in Chart Tracker), and does not decrease due to the amortization is not doing at source currency.