2011-01-01 * Opening balance
    Assets:Broker                           250.00 GBP = 250.00 GBP
    Equity:Opening balance                 -250.00 GBP

2011-02-01 * Buy 1 AAA for 10.00 GBP
    Assets:Broker                                1 AAA = 1 AAA
    Assets:Broker                           -10.00 GBP

2011-03-01 * Buy 1 AAA for 10.00 GBP
    Assets:Broker                                1 AAA = 2 AAA
    Assets:Broker                           -10.00 GBP

2011-04-01 * Buy 1 BBB for 15.00 GBP
    Assets:Broker                                1 BBB = 1 BBB
    Assets:Broker                           -15.00 GBP

$ hledger -f- check

#test bal
#               2 AAA
#               1 BBB
#          215.00 GBP  Assets:Broker
#         -250.00 GBP  Equity:Opening balance
#--------------------
#               2 AAA
#               1 BBB
#          -35.00 GBP
#end test
#