2011-01-01 * Opening balance
    Assets:Cash                               25.00 GBP
    Equity:Opening balance                   -25.00 GBP

2011-02-01 * Buy 1 AAA for 10.00 GBP
    Assets:Investments                 1 AAA {10.00 GBP}
    Assets:Cash                              -10.00 GBP

2011-03-07 * Sell one AAA with a gain
    Assets:Cash                               12.00 GBP
    Assets:Investments  -1 AAA {10.00 GBP} @@ 12.00 GBP
    Income:Capital gains                      -2.00 GBP

2011-04-01 * Buy 1 BBB for 15.00 GBP
    Assets:Investments                 1 BBB {15.00 GBP}
    Assets:Cash                              -15.00 GBP

test bal -B Assets:Investments -p "until 2011-02-20"
           10.00 GBP  Assets:Investments
end test

test bal -B Assets:Investments -p "until 2011-03-20"
end test

test bal -B Assets:Investments -p "until 2011-04-20"
           15.00 GBP  Assets:Investments
end test

test bal Assets:Investments -p "until 2011-02-20"
               1 AAA  Assets:Investments
end test

test bal Assets:Investments -p "until 2011-03-20"
end test

test bal Assets:Investments -p "until 2011-04-20"
               1 BBB  Assets:Investments
end test