reg --set-account='payee + ":" + commodity'
<<<
2007/02/02 RD VMMXX
    Assets:Investments:Vanguard:VMMXX  0.350 VMMXX @ $1.00
    Income:Dividends:Vanguard:VMMXX        $-0.35
>>>1
07-Feb-02 RD VMMXX              RD VMMXX:VMMXX          0.350 VMMXX  0.350 VMMXX
07-Feb-02 RD VMMXX              RD VMMXX:$                   $-0.35       $-0.35
                                                                     0.350 VMMXX
>>>2
=== 0