2020-01-01 * ACME, Inc.
    Assets:Shares        1 ACME @ 1000.00 USD
    Assets:Bank:Checking account
2021-01-01 * ACME, Inc.
    Assets:Shares        1 ACME @ 1000.00 EUR
    Assets:Bank:Checking account

P 2020-07-01 EUR 1.5 USD

; I have 2 ACME Shares
; worth 2000 EUR
; worth 3000 USD because the last exchange rate was 1.5
; in terms of nodes there should be
; 2021-01-01 ACME
; 2021-01-01 EUR
; 2020-07-01 EUR
; 2020-07-01 USD
; NOTHING for 2020-01-01
;