2015/05/01  Opening Balance
    Assets:Cash                     100 TZS
    Equity:Initial Capital

2015/05/07  Prepay for EUR
    Assets:Cash                     -50 TZS
    Currency:TZS                    50 TZS
    Assets:EUR                      55.556 EUR
    Currency:EUR                    -55.556 EUR

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ledger -f prepaid.dat balance
          55.556 EUR
              50 TZS  Assets
              50 TZS    Cash
          55.556 EUR    EUR
         -55.556 EUR
              50 TZS  Currency
         -55.556 EUR    EUR
              50 TZS    TZS
            -100 TZS  Equity:Initial Capital
--------------------
                   0


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ledger --version
Ledger 3.1.0-20141005, the command-line accounting tool