As per CRA: Corporations filing in functional currency should continue to use the standard CRA -produced T2 return and schedules or a CRA -approved commercial software package. You must file Form T1296, Election, or Revocation of an Election, to Report in a Functional Currency, in order to submit a functional currency return. When a corporation files an agreement in functional currency, the entire schedule must be completed in functional currency. The associated or related corporations must also each file the same schedule in Canadian currency or the currency in which they have elected to file.
Corporations filing an election in functional currency must indicate on line 079 of the T2 Return the functional currency being used.