Check balances against simple expressions combining multiple accounts in beancount.
pip install beancount_balexpr
plugin "beancount_balexpr.balexpr"
1990-01-01 open Assets:A USD
1990-01-01 open Assets:B USD
1990-01-01 open Equity:OpenBalance USD
1991-01-01 pad Assets:A Equity:OpenBalance
1991-01-01 pad Assets:B Equity:OpenBalance
1991-01-02 balance Assets:A 213.00 USD
1991-01-02 balance Assets:B 264.00 USD
1991-01-03 custom "balexpr" "Assets:A+Assets:B" 477.00 USD
1991-01-03 custom "balexpr" "Assets:A+200.00" 413.00 USD
1991-01-03 custom "balexpr" "Assets:B*(Assets:A+200.00)" 109032.00 USD
1991-01-03 custom "balexpr" "Assets:A-Assets:B" -51.00 USD
1991-01-03 custom "balexpr" "Assets:A*Assets:B" 56232.00 USD
1991-01-03 custom "balexpr" "Assets:A/Assets:B" 0.81 USD
1991-01-03 custom "balexpr" "Assets:A+Assets:A*Assets:B" 56445.00 USD
1991-01-03 custom "balexpr" "(Assets:A+Assets:A)*Assets:B" 112464.00 USD
1991-01-03 custom "balexpr" "
Assets:A +
Assets:B" 477.00 USD
- Does not support the account names with dashes because they are conflicting with the minus sign