Eu ETS - Allowance transfer - fx gain loss

Imposible to reconcile Allowance transfers due to invoice and transfer don´t use same exchange rate.

Allowances will always be in EUR. The Allowance invoice is posted with daily exchange rate.
The allowance Transfer is posted with purchase price and exchange rate from the linked trade. The price adjustment between the invoice price and purchase price is calculated based EUR amount and included in a separate line in the transfer document. Then there is a fx gain loss difference in the P/L as it is showed in USD to two different exchange rates.

I suggest the fx gain loss to be included as a separate line in the invoice (same way as price adj is handled).