ABAP ALV - Totalling using 2 different currency FIELDS

HI,

I have 2 currency fields in my alv output.Local currency and Tran. Currency.

There are  local amount fields and  transactional amount fields in my alv.

Transaction amounts should be totalled according to transaction currency.

Local Amounts  should be totalled according to local currency.

But all amounts are totalled by Transaction Currency.

My Current output :

Totals:

110            USD            150                USD

220            CAD            100                CAD

My original output should be:

Totals:

110            USD            110                USD

220            CAD            140                CAD

Thanks in Advance.