Forum Discussion

nauriso1's avatar
nauriso1
Frequent Visitor
9 years ago
Solved

Running Total multiple currency conversion to one

Hello   I have such simplified data model - with various currencies. I have to covert all those currencies in one  - running total EUR for each date in dimCalendar table facttable contains ,...
Need Help
  • OwenAuger's avatar
    OwenAuger
    9 years ago

    nauriso1

    Apologies, missed that detail.

    So the running total of transactions in each local currency is revalued daily in EUR at the current rate.

     

    This measure will do the trick in the model you uploaded:

    Running Total EUR = 
SUMX (
    dimCurrency,
    [Running Total]
        * CALCULATE (
            VALUES ( dimCurrencyExchange[Exchange Rate] ),
            LASTDATE ( dimCalendar[Date Key] )
        )
)

    The LASTDATE(...) is just there to ensure correct calculation at a total level when multiple dates are selected.

     

    Model uploaded with new measure here for reference

     

    Cheers,

    Owen

OwenAuger's avatar
OwenAuger
Super User
9 years ago

Hi nauriso1

 

I would tweak the data model & measures slightly to get this to work:

Sample model here

 

First of all, I would suggest you add a dimCurrency table to your data model, which contains a unique list of currency IDs/Names, and relate dimFX and fctTable to dimCurrency.

So you end up with fctTable & dimFX both related to dimCalendar & dimCurrency:

 

Then I would define the measures below. [Amount EUR] iterates over the combinations of Date/Currency present in fctTable and uses relationships to look up the exchange rate (at Date/Currency granularity):

 

Amount Local Currency = 
SUM ( fctTable[Amount] )

Amount EUR =
SUMX (
    SUMMARIZE ( fctTable, dimCalendar[DateKey], dimCurrency[CurrencyId] ),
    // Note: VALUES ( dimFX[ExchangeRate] ) is safe because
    // dimFX[ExchangeRate] has exactly one value for any DateKey/CurrencyId combination
    CALCULATE (
        VALUES ( dimFX[ExchangeRate] )
    )
        * [Amount Local Currency]
)

Amount EUR Cumulative = 
CALCULATE (
    [Amount EUR],
    DATESBETWEEN ( dimCalendar[DateKey], BLANK (), MAX ( dimCalendar[DateKey] ) )
)

Then the output looks like this:

Variations on this are possible, but this seems a good way of doing it to me.

 

You could also pre-calculate [Amount EUR] in fctTable either in the Query Editor or with DAX.

 

Hopefully that is of some use.
Cheers,

Owen :)

nauriso1's avatar
nauriso1
Frequent Visitor
9 years ago

Thanks OwenAuger for your replay, but I need, that running total is converted to EURos not transactions. In your case at first are transactions converted to EUR and then running total is made, which is not correct (because exchange rate used for running total is based on transaction date exchange rate, but I need that for running total would be applied appropriate date exchange rate regardless of transaction date.. So thats mean, tad running total should be converted by each date exchange rate) 
I attached excel and pbx file. Hope that this will more clarify what I want achieve

RunningTotalCurrency_Conversion.pbix

RunningTotalCurrency_Conversion.xlsx

 

  • OwenAuger's avatar
    OwenAuger
    Super User
    9 years ago

    nauriso1

    Apologies, missed that detail.

    So the running total of transactions in each local currency is revalued daily in EUR at the current rate.

     

    This measure will do the trick in the model you uploaded:

    Running Total EUR = 
SUMX (
    dimCurrency,
    [Running Total]
        * CALCULATE (
            VALUES ( dimCurrencyExchange[Exchange Rate] ),
            LASTDATE ( dimCalendar[Date Key] )
        )
)

    The LASTDATE(...) is just there to ensure correct calculation at a total level when multiple dates are selected.

     

    Model uploaded with new measure here for reference

     

    Cheers,

    Owen

    • nauriso1's avatar
      nauriso1
      Frequent Visitor
      9 years ago

      Thanks OwenAuger! Could you, please, explain, what is happening "behind the scenes"?

      • OwenAuger's avatar
        OwenAuger
        Super User
        9 years ago

        nauriso1

        Sure.

         

        To put the Running Total EUR measure in words:

        For each currency, calculate the Running Total in that currency, then multiply that by the Exchange Rate as at the date selected (or last date if multiple dates are selected).

         

        Or describing what the DAX is doing:

        1. SUMX iterates over each currency
        2. For each currency, the [Running Total] measure returns the Running Total at the currently selected date (or max date)
        3. This is multiplied by VALUES ( dimCurrencyExchange[Exchange Rate] ), calculated in the context of LASTDATE ( dimCalendar[Date Key] ) which should just have one value.
        4. Since the VALUES(...) from Step 3 is wrapped in a CALCULATE, context transition means the current Currency is added to the filter context, and filters the dimCurrencyExchange table appropriately.

        One potential performance issue is that we are iterating over all currencies, regardless of whether they have had transactions so far. If it is likely that they all have, then this doesn't matter.

        Otherwise, you may consider iterating over just those currencies that have occurred so far, but I would test performance to see if it is worth it. Something like this:

         

        Running Total EUR =
SUMX (
    CALCULATETABLE (
        CALCULATETABLE ( dimCurrency, fctTable ),
        DATESBETWEEN ( dimCalendar[Date Key], BLANK (), MAX ( dimCalendar[Date Key] ) )
    ),
    [Running Total]
        * CALCULATE (
            VALUES ( dimCurrencyExchange[Exchange Rate] ),
            LASTDATE ( dimCalendar[Date Key] )
        )
)

        Cheers,

        Owen

    • thomas_DBV's avatar
      thomas_DBV
      New Member
      3 years ago

      Thanks, very useful and elegant solution 🙂